The sleepy town of Graham, WA, gets a jolt in November 2007 when young newlyweds Brian and Beverly Mauck are found shot to death in their rural home. Leads from friends and family send police on a wild goose chase, but cops soon find out one helpful tipster is the ruthless killer.

The 1991 savage rape and murder of 22-year-old Cindy Pavey, single mom of 2, rattles the tranquil town of Murphysboro, IL. Police investigate a potentially deadly love triangle, but it will take 17 years to harvest the leads necessary to bring her killer to justice.

When Bob Eidman is found executed in his office in broad daylight, the people of St. Charles are terrified a cold-blooded killer is on the loose. But when police discover Bob's secret life, they expose a slew of suspects with motive for murder.

The charming town of Macon, GA, panics when Mercer Law School grad Lauren Giddings goes missing, and police search her apartment complex, finding a human torso in a trash bin. Detectives uncover multiple suspects with motive and means. But only one person in the group is sadistic enough to kill.

After beloved retired custodian James Mayberry is found stabbed to death in his Midwest home in 2002, the folks of Wichita, KS, are in shock. Detectives are stumped until a break comes faster than a prairie tornado that pins down the heartless killer.

When Nikki Halpin, a divorced mother of 2, is brutally beaten at home in front of her children. She was found barely alive, but later died at the hospital. The residents of Safety Harbor, FL are terrified that a violent intruder is on the loose. But when a mysterious voice on the 911 recording reveals an eerie clue, detectives zero in on an unlikely suspect.

When Goshen, NH, resident 55-year-old Edith 'Pen' Meyer goes missing, the tiny vacation town fears the worst. Police find leads, but can't find the body. When a notorious resident reveals a grudge, police move in quickly to catch a killer.

The quiet town of Tomahawk, WI, is rocked when long time resident 42-year-old grandmother Tracy Maurer is found brutally stabbed to death in her home. Police have a laundry list of suspects but it's a tip from the rumor mill that finally brings closure to the case.

In late 2007, Jasper, TX, native Martin Byerly disappears without a trace. Police look into the 58-year-old ladies man's dance card but can't seem to pin anything on a femme fatal. Then an unlikely tipster helps them learn what happened to Martin.

When friendly cashier Tammy Petrin is found shot execution style at the local burger joint in 1991, the town of Woonsocket, RI, is in shock. After lead suspects don't serve up answers, a helpful hooker and letters from jail might be just what detectives ordered.

When 12-year-old Michelle Winter goes missing without a trace while walking back from her best friend's house in Springfield, MO in 1995, her mom doesn't have a clue as to who could have whisked this pre-teen away. Cops have many leads, but it isn't until evidence is linked to the killer that they get their big break.

When Austin York, Matt Self, Mark Barbosa, and Rosa Barbosa are found dead in a McKinney, TX home, detectives embark on a three year investigation. And just when it seems like the murders may never be solved, an eyewitness breaks the case wide open.

When the Korean-American Chae family is terrorized in their suburban home in 2009 in North Wales, PA, only three survive. Local investigators wonder if this is a robbery gone wrong or something more. As the case unfolds, police are shocked to learn of the betrayal behind the murder.

The bloody murder of Beth Grosskopf in 2009 leaves the town of Freedom, PA, riddled with fear. Hopes for quick justice are dashed when the initial suspects don't pan out. But when someone reveals his inner demons, cops move in to catch the killer.

The gruesome slaying of adored resident and wife 48-year-old Debra Rawls in 2004 leaves the small town of Summerfield, FL, paralyzed with fear. A swath of hooligans quickly deepens the suspect pool, but a speck of blood makes the biggest splash in discovering the true identity of the killer.

In Portsmouth, VA, a father comes home to find his 16-year-old daughter stabbed to death. With DNA and fingerprints police hope for an open and shut case. However, the case still goes unsolved for months until a piece of gum points to an unlikely suspect.

Ann Branson is found stabbed and beaten to death in her Kentucky home. There is little evidence at the crime scene and investigators struggle to find a motive. Ann's financial records provide the break authorities need to help catch the killer overseas.

When 18-year-old Breanna Schneller is discovered stabbed to death and her throat slashed in her apartment where she lived with her fiancé and his brother, the residents of tranquil Wausau, WI, are stunned. Police hope a cell phone and surveillance videos can help them unravel the mystery surrounding Breanna's death.

Shoreline, WA is shattered when 43-year-old nurse Renee Powell is murdered and her home set afire. When the killer strikes again exactly 30 days later with the same M.O., police fear they have a serial killer on their hands. But the trail grows cold and it takes a jilted lover to shake this case loose.

In Owego, NY, Michele Harris disappears on September 11, 2001. Would she really leave behind her four children and run away from her soured marriage? When blood splatters are found in the home, police begin to suspect that Michele may have met a more sinister end.

When 18-year-old Brittany Loritts is murdered in her Salisbury, NC, home in the summer before starting college, investigators are at a loss as to who would commit such a crime. The case gets hot when investigators find that the family home is built on buried secrets.

A dream life ends when pretty mom-to-be Kelsey Monahon is found hogtied and beaten in her beachfront home.At first, the bizarre scene looks like a home invasion, but detectives dig deeper and turn up a trio of unlikely suspects including Kelsey's husband.

Karin Strom is discovered strangled to death in her home. When a suspect emerges, investigators don't have enough evidence for a conviction. It will take twenty-six years to ultimately prove their case, and the final outcome surprises everyone.

23-year-old Stephanie Bennett is brutally raped and murdered in her suburban Raleigh apartment. Investigators work the case for years but their leads go nowhere. A closer look at a peeping tom provides police the break they desperately need.

When 34-year-old single mom of three Joanna Presti and her 12-year-old daughter, Alyssa, are found slain in their Woburn, MA, home, police sift through exes and neighbors to nab their murderer. But when a mysterious photo is found in the Presti home, a killer is exposed.