Westfield, NJ - an affluent suburb just outside the bustle of New York City, is home to picture-perfect homes and families alike. In the grand home of John List and his family, a true monster hides behind the stately facade.

Reggie and Carol Sumner live in Jacksonville, FL, where the 61-year-old retirees have recently settled into a more relaxed lifestyle. But when they mysteriously go missing after a visit from a former neighbor, investigators have to wonder if they left on their own.

When Denise Sam-Cali and her husband, John Cali, discover that someone has broken into their Allentown, PA home in 1993, they think they know who did it. One week after the break-in, Denise comes face to face with the intruder -- and she has no idea who he is.

When divorced single mother Chanin Starbuck comes home to find her house has been vandalized, she fears her ventures in online dating are to blame.

After Lois Pearson turns down a date with her neighbor Jeffrey Maxwell, she thinks that's the last she'll see of him on her rural Weatherford, TX, land. Six years later, he's back, and it's clear he's still holding a grudge.

Nancy Ludwig is a married flight attendant from Minnesota who never travels alone but offers to break her own rule once for a quick trip to Detroit, but she finds more than she bargained for in her hotel room.

In Roseville, MN, 36-year-old former teacher Mary Stauffer and her 8-year-old daughter Beth are kidnapped and held hostage by a man exacting revenge from his high school days.

After a encounter with a peeping tom outside his daughter's bedroom window and another with a masked man in his own hallway, Jerry Glaser thinks someone is trying to kill him, so he takes his life into his own hands to protect himself and his family.