Before her wedding, Alison looks at Rafe's mother's pic, then says she can't marry Rafe. She explains his mother was her father's mistress, meaning they might be siblings. Rafe thinks Caleb's setting them up and tells her Caleb bit Elizabeth. Ali's devastated to learn her mother's a vampire and Rafe may be her brother. Rafe asks a doubtful Ali to believe in him. He comforts her and they begin to make love. Tess climbs out of the water but falls in trying to rescue Livvie. Submerged, Tess grabs Livvie and they twirl until they merge into one, then the hybrid Livvie/Tess emerges. Sensing she's in trouble, Caleb cries out for ""Olivia,"" which Elizabeth hears. Caleb asks Elizabeth to marry him. Lucy tries to stop the impromptu wedding to no avail. Later, Caleb makes love to Elizabeth but thinks of Livvie, whose spirit appears to him, asking him to find her. Caleb goes to Livvie on the docks and says he won't hurt her but she says she's Tess not Livvie. He realizes they've merged back into o

Alison tells Lucy she & Rafe could be siblings. Rafe insists Caleb's behind it and Lucy tells him Caleb married Elizabeth. Ali's upset by the news, then finds a hidden pic of her dad with Rafe's mom. Jack stops Caleb before he can bite Tess. They struggle but Caleb's strength wins out. However, Caleb is uable to bite Tess. Jack says it's because Tess is pure good but Caleb vows he'll have her, then disappears. After biting Ian, Elizabeth tries to seduce him, but he runs off and shows up at Lucy's. Caleb returns and sees blood on her. Although she denies feeding, he says if she did, he'll kill that person and her too.

Kevin asks Jack where Livvie is but Jack doesn't know. Learning Livvie's wallet was found by the docks, Jack then claims she left town, but Kevin doesn't believe him. Jack wonders if Tess did something to Livvie. Kevin meets Tess on the docks, then accuses her of killing Livvie when she says Livvie fell in the water. Alison tells Rafe they can't see each other anymore until she gets proof they're not related. Caleb demands the truth from Elizabeth, who denies feeding. Bursting into Stephen's studio, Rafe threatens Joshua, roughs up Caleb's band of vampires and promises to destroy Caleb. Sensing his presence, Caleb appears.

Lucy finds an ailing Ian, who insists she leave before he hurts her. Realizing what he's become, Lucy asks him to trust her so Ian shows her his fangs. Tess tells Kevin that Livvie didn't die- she's inside her. Tess tries to heal Kevin's anger by putting her hand on his heart, but he pushes her away and accidentally knocks her into the harbor. Caleb denies Rafe's charges that Caleb's responsible for making Alison think she & Rafe are related. Rafe reminds Caleb through visions how Livvie's betrayed him, then Caleb shows Rafe a vision where he bites Ali. Caleb disappears, then reappears behind Rafe, snapping his neck.

Lucy vows to stick by Ian, even though he's a vampire. Rafe lives and reveals neither he nor Caleb can the kill the other. Caleb threatens to kill Alison if Rafe doesn't end their war. Ali asks her mother if she's a vampire but Elizabeth denies it. She tells Ali she married ""Stephen"" but denies he's Caleb or was involved in Ali's discovery that she and Rafe are siblings. When Ali agrees to move in with Elizabeth and Stephen, Rafe bursts in and carries her out. Kevin lets Tess drown and lies to a worried Jack that he hasn't seen her. Caleb rescues her and brings her to his mansion, vowing he's the only one she can trust.

Alison tells Rafe she plans on moving in with Stephen and her mother to spy on them to see if Caleb set them up to be brother and sister. Lucy implores Ian to get ahold of Caleb's ""water,"" so Ian breaks into Stephen's apartment but is caught by Elizabeth. Wearing Livvie's wedding dress, Tess insists she's not Livvie, but Caleb's sure Livvie will emerge. Tess remembers Livvie marrying Caleb and kisses Caleb. However, when she tries healing him, he realizes she's still Tess and makes her vanish. Kevin tells Lucy that Livvie might be dead and he may have killed Tess. Jack overhears and attacks Kevin, then Tess appears.

Caleb tells Joshua not to interfere with his pursuit of Livvie. Jack, Lucy & Kevin find Tess unharmed but Kevin's harsh words to Tess surprise Lucy, who suggests he return to the hospital. Alone, Tess tells Jack that ""Stephen"" rescued her and took her to his villa. Jack realizes Caleb will come after her again because she looks like Livvie. Elswhere, Caleb sings ""The Gift"" for Livvie. Elizabeth gives Ian the ""water"" but tells him he must stay away as Stephen will kill them both. Ian convinces her to leave Caleb and then departs. Caleb returns, but Elizabeth distracts his suspicions by seducing him.

Instructed by Rafe, Alison plants surveillance cameras in Caleb's apartment. When Elizabeth arrives, Ali almost admits she knows her mother's a vampire, but quickly covers and leaves. At G.H., Ian almost makes a possible fatal mistake with a patient and then abruptly leaves. He goes back to Elizabeth and tells her the ""water"" is not working. Jack asks Tess to marry him right away and she agrees. Jack then warns Jamal to get Marissa away from Caleb right away, so Jamal tells her that her mother called and wants her to go home. While Jack is out preparing for the wedding, Caleb shows up and greets Tess.

Ian refuses to accept he's a vampire but Elizabeth encourages him to feed off her. She kisses him and starts to seduce him and he bares his fangs. Lucy gives Kevin an ultimatum- return to the hospital or she will leave him. When Kevin refuses her demands, she goes to Rafe's and sees Ian and Elizabeth getting passionate on the surveillance cameras. While Reese distracts Jack by playing damsel in distress, Caleb confronts Tess, trying to appeal to Livvie inside her. Tess tells him she's marrying Jack, but Caleb won't allow it. He wants to sing ""Surrender"" for her but she stops him by putting her finger to his lips.

Lucy calls the fire department to break up Ian and Elizabeth's passion. Lucy then gets Ian away from Elizabeth before he can bite her. Caleb tries singing to Tess but no words come out of his mouth. Tess says she won't let him use his music to do harm and vows to help free him from the darkness. Jack realizes Reese is stalling him, per Caleb's insructions, so he races home to Tess but doesn't find Caleb. A minister performs a wedding ceremony for Jack and Tess and pronounces them man and wife. Caleb discovers his singing voice has been silenced, then dreams Tess comes to him in her wedding dress and kisses him.

Alison finds a police report about her father's death in Caleb's home. Ali and Rafe wonder if Caleb killed her father and plan a trip to Capri to investigate. Elizabeth decides to accompany Ali. Jack warns Tess away from Caleb after learing he visited her before the wedding. Jack asks Rafe to train him as a vampire slayer and Rafe agrees. Caleb tells Kevin that Livvie's alive but trapped inside Tess. Caleb asks Kevin to help bring Livvie back by getting close to Tess. Kevin agrees, then visits Tess. When Ali calls Caleb on being a bad husband to her mother, she mistakenly calls him ""Caleb"" instead of ""Stephen.""

Alison quickly covers after she accidentally calls Caleb by his real name, instead of ""Stephen."" Caleb threatens to harm both Elizabeth and Ali if Elizabeth told Ali his true identity. Caleb orders Joshua to accompany Ali and Elizabeth to Capri to keep an eye on them. Kevin apologizes to Tess and asks to be a father to her. Kevin then reports his progess with Tess to Caleb. Chris visits Ian's loft and insinuates Ian and Lucy are lovers when he sees Lucy there. Ian starts strangling him but Lucy gets him to stop. A choking Chris grabs Ian's ""water"" and drinks it, then starts to feel strange. He then announces he's a vampire!

Jack is suspicious when Tess says her father (Kevin) invited her to dinner so he tags along. Ian and Lucy realize Caleb's ""water"" has made Chris think he's a vampire, but he's really not. When Chris jumps off a building to ""fly"", Ian pulls him back up and saves his life. Realizing he still has human tendencies, Lucy urges Ian not to give up on himself. Joshua, Alison and Elizabeth fly to Capri on Stephen's private plane, along with Rafe who's stowed away. After drugging Elizabeth to sleep, Joshua comes on to Ali, who resists his advances. Joshua almost discoves Rafe until Ali distracts him by giving in to his charms.

Ian thanks Lucy for stopping him from feeding on Elizabeth but she says she only wanted to stop him from making love to her. Giving in to their desire, Ian and Lucy start to kiss. Rafe stops Alison's charade with Joshua by creating turbulence for the flight. Elizabeth awakens and berates Joshua for coming on to Ali. Suspcious, Joshua searches the plane but doesn't find Rafe, who later appears in Ali's hotel room. Jack stands guard while Tess is alone with Kevin. Kevin hypnotizes Tess but then Caleb appears and takes her away to the woods. Caleb sings ""Surrender"" to Tess until Livvie emerges, then they kiss.

Rafe gives Alison an impromptu honeymoon, minus any passion, when she sadly reflects on their lost honeymoon. Ian halts his passion with Lucy but says he'll fight his vampire urges because he knows she'll wait for him. After Kevin says Tess is nothing to him, Jack knocks him into a wall. Caleb's music awakens Livvie, who briefly reunites with Caleb until Tess emerges and says Caleb can't have Livvie. Caleb urges Livvie to return. Tess then has flashes of merging with Livvie and passes out. At G.H., an injured Kevin sees Ian and Lucy together. Jack tells them Caleb took Tess, then Caleb arrives with an unconscious Tess.

At G.H., a shaky Ian revives an unconscious Tess. Caleb tells Kevin that Livvie came back but Tess fought her until she collapsed. After Kevin explains Tess suffered trauma, Jack threatens Kevin if anything happens to her. An eager Reese wants to bite Ricky but Caz warns her to wait until Stephen says so. When Caz leaves, Reese seduces Ricky and almost bites him but Caz returns and stops her. Jamal tells Marissa that Stephen really is Caleb. Marissa goes to Stephen's studio to get proof he's a vampire but Reese catches her snooping. Lucy warns Caleb to stay away from Tess but he later appears in her hospital room.

Kevin tells Jack that Tess has Livvie, but Jack doesn't believe him. Marissa covers when Reese catches her snooping and snags a roll of film. Caleb apologizes to an unconscious Tess for hurting her. When he kisses her, she awakens. Jack reunites with Tess, who sees Caleb through the window. On board the yacht Malcolm died, Alison tells Elizabeth she's there to find proof she's not related to Rafe. Joshua's suspcious when he catches them searching the yacht. A hidden Rafe overhears Joshua pay off the captain who lied to the police about seeing Joshua on board when Malcolm died, but then Joshua knocks Rafe out from behind.

Lucy suggests Ian go to his cabin to get away and he agrees. Once they arrive, they see Caleb's ""water"" has spilled from the bottles. The yacht captain plans to throw a chained up Rafe overboard but is distracted when Alison reports a fire on deck. When Ali shows up, Rafe tells her Joshua & Caleb may have killed her father. Elizabeth tells Joshua about Ali's quest to prove Rafe's not her brother. After drugging Elizabeth, Joshua learns Ali's on the yacht and orders Rafe killed. The captain points his gun at Rafe, who frees himself from the chains and knocks the gun out of his hand. Ali returns to the hotel to face Joshua.

Ian and Lucy are trapped at his cabin without Caleb's ""water."" Offering to stay with him through his crisis, Lucy kisses him and they soon make love. Rafe demands the yacht captain tell him what he knows about Joshua, Caleb and Malcolm's death. The captain then leads Rafe to a graveyard and Rafe begins digging. Joshua threatens to kill Alison for learning too much. When he intends to have his way with her first, Elizabeth jumps up and bites him. When Tess goes home from the hospital, she tells Jack not to worry about Caleb. As a butterfly, Caleb lures Tess to the woods, then surprises her with a horse-drawn carriage.

Caleb takes Tess on a carriage ride and feels attracted to her kindness but reminds himself he wants Livvie. Tess thanks him for the date, then goes home to Jack. After making love, Ian doesn't feel pain and credits Lucy for temporarily curing him. When Gail's worried about Lucy, Kevin shows up at the cabin to check on her. Lucy tries to hide her tryst with Ian, who exposes it to Kevin. After Elizabeth kills Joshua to protect Alison, Ali helps her get rid of the body and urges her mom to leave Caleb. When Joshua doesn't answer Caleb's phone call, Caleb shows up unexpectedly just as Ali and Elizabeth are hiding the body.

Confronted by Kevin, Lucy chooses Ian over her husband. Marissa sees the pics she stole from Reese, which prove Stephen and his band are vampires, then Reese & Caz try to kill her. Marissa's saved when her late twin Casey appears! Alison & Elizabeth lie to Caleb about Joshua's whereabouts. Elizabeth tells Caleb she's leaving him, but he seduces her. Rafe tells Ali her mother's now a full-fledged vampire because she killed. Rafe disposes of Joshua's dead body. An upset Ali sees Caleb & Elizabeth making love. Rafe reveals he found papers which prove Ali's sibling's a girl, so Rafe can't be her brother! Rafe & Ali joyously reunite.

After Caleb leaves her, Elizabeth wants to return home right away with Alison. However, a mysterious fog grounds their plane, so Ali and Rafe pass the time by making love. After saving Marissa, Casey says she must leave town forever for her and Jamal's safety, but won't remember coming to town. Casey will take over her life. After sending her home, Casey runs into Jamal, who thinks she's Marissa. Tess meets Caleb at the spot of their date. He says his wife left him and asks her to help find the good in him. Tess accuses him of trying to trick her because he wants Livvie. She says she won't be fooled by him and leaves.

Rafe tells Alison they must keep their relationship a secret from Caleb. He says he must focus on his fight with Caleb and she offers to help. After Lucy and Ian make love again, he wonders if her lovemaking is a cure for his vampirism. An angry Kevin spies on them and then kidnaps Lucy. Jamal's surprised by ""Marissa's"" new look and attitude. When she refuses to quit Stephen's band, he walks out on her. Ricky's surprised to see Casey, who he thinks is Marissa. Casey and Reese come to blows. Caleb's thoughts are on Tess and not his music. Caleb learns Joshua's missing and blames Rafe, who vows to come after Caleb.

After kidnapping Lucy, Kevin pleads with her to give their marriage one last chance. Kevin takes Lucy to a hotel room for romance and Lucy pretends to give in, but eyes the telephone. Ian's vampire symptoms return without Lucy. Realizing Kevin took Lucy, Ian vows to kill him if he hurts Lucy. Caleb declares war on Rafe for killing Joshua, which Rafe denies. Caleb then speculates Alison killed him. Back home, Elizabeth has visions of Joshua and thinks he's haunting her. Alison thinks it's her guilt, but Elizabeth says she enjoyed killing him. When Ali sleeps, Caleb arrives and stands over her baring his fangs.

After Rafe stops Caleb from biting Alison, Caleb realizes Rafe and Ali have reunited. Caleb demands to know who killed Joshua. When Elizabeth admits she did it, Caleb vows to hurt her, then vanishes. Jack takes Tess on a date but is surprised when she picks out Livvie's favorite song in the jukebox. Chris arrives and says Tess's latest test results show she now has DNA and is a real person. Kevin pleads with a captive Lucy to give their marriage another try. Lucy pretends to give in but tries to use her cell phone until Kevin stops her and refuses to let her go. Ian then burst in, baring his fangs and knocking Kevin down.