Your Worst Nightmare - Season 1

Everyone loves 25-year-old graduate student Sandy Jeffers, but little does she know that one man is completely obsessed with her. When she finally comes face to face with her stalker, the events that follow are twisted, torturous, and ultimately fatal.

2006, Pocatello, ID. It's Cassie Jo Stoddart's first weekend house sitting by her herself, and she's determined to do a great job, but the high school student's weekend turns into a real-life horror movie when unexpected visitors terrorize the home.

When Martha Brailsford goes out sailing in Salem, Massachusetts, and doesn't return, her friends and family immediately suspect that something terrible has happened.

Two teenagers in love go missing from rural Logan, OH, and ten days later they both turn up dead -- brutally hacked to bits. The crime tears the small town apart, and it remains unsolved for 25 years until the shocking truth comes to light

Matthew Heikkila has always had a rocky relationship with his parents, but he has a plan on how to deal with them. On a cold November day, he murders them in their own home -- and is determined to keep the nightmare going for his girlfriend, Linda Perez.

Dana Point, CA. 1988: Weak, tired, confused, and deathly ill, Janet Overton, a wife and mother, was once the picture of health until she suddenly drops dead in her own driveway. Detectives must determine if her death was due to an undiagnosed illness or cold-blooded murder.