A professor’s assistant goes missing at sea near the end of a long voyage. Clues to her disappearance are detailed in a diary discovered in her cabin. How did she disappear?

A family of four takes the cruise of a lifetime, but only three return home; their desperate search for their missing adult daughter begins, with all signs pointing to a kidnapping.

A scratch and win ticket unveils an all-expense paid cruise for a young couple; but their luck runs out once aboard the ship as one of them ends up murdered.

A German college student working aboard a cruise ship goes missing at an Alaskan port. Did she decide to skip out on her duties or did a terrible fate await her on-shore?

A successful businessman takes a luxury cruise with two former college roommates. When he goes missing, all signs point to foul play.

A retired teacher goes solo on a Great Lakes cruise traveling to a family reunion in Ohio. But when she doesn't check in with her family members back home, they begin to suspect something bad has befallen her.

A surprise cruise holiday for a husband and wife from Olympia, Washington ends up with one of them going overboard. Was it revenge, jealousy or a murderous impulse at sea?

A honeymoon cruise goes awry when the bride is allegedly blown off a balcony in the middle of the night. But when the weather report comes in showing no wind, a murder investigation begins.

A 40-year-old disappears on the second night of a cruise, her family is left searching for answers and it ends up changing the way missing persons are reported at sea.

A sous chef aboard a cruise ship leaves her shift unexpectedly and is never seen again. Did the pressure of the kitchen make her take her own life or did foul play occur? Did someone aboard see her before she disappeared?

A husband and wife take a cruise to celebrate their good luck in business. But their luck takes a turn at the apex of their journey, with many wondering what happened aboard the ship.

Newlyweds board a cruise ship, but things take a turn for the worse when one disappears in the middle of the night. A blood-stained canopy is the only telltale sign of a young man’s fate, leaving many more questions than answers to what happened.

A savvy poker player cleans up at the tables once at sea. But after she witnesses a man overboard, many begin to wonder if it was accidental or on purpose - and who is next?

A farmer and his wife take a well-deserved cruise, but their celebrations are cut short when one of them goes missing at sea.

When a tech inventor vanishes aboard a chartered ship, detectives investigate whether her invention was connected to her disappearance.

A social media maven takes to the seas on a cruise she believes will boost her profile - but her trip is fatally cut short, and detectives must find out why.

A fashion writer gets more than she bargained for on a cruise from London to New York. What happened is a mystery - but someone on board can fill in the blanks.

A father-daughter cruise comes to a disastrous end when the dad goes missing and a family is torn apart.

When a wealthy San Francisco socialite is bludgeoned to death with a whiskey bottle, a key witness on board may be able to help investigators solve the shocking murder.

When a youth ministry attendee disappears aboard a cruise ship, detectives suspect that someone in the ministry may have something to hide.

A friendly entrepreneur and her son board a cruise ship for a much-needed vacation away from their worries when she suddenly vanishes, devastating her son. Did her financial troubles get the best of her? Or is there someone on board who murdered her?

A high-school reunion cruise should have been filled with fun and nostalgia, but instead the celebrations take a turn when a former star student winds up dead.

Former university acquaintances meet aboard a cruise ship, including one who is an eccentric knife collector. When someone on board the ship ends up stabbed, all fingers point to the collector and his odd behavior.

A smarmy, womanizing, egotistic real estate agent goes on a luxurious cruise vacation and gets more than he can deal with when he's discovered dead on deck. Was it a tragic accident that befell him or did someone have an axe to grind with this deal maker?

A Fourth of July cruise turns deadly as a passenger vanishes moments after leaving the dance floor. The details of what occurred that night continue to haunt family and friends.