Summary: Military veteran Michael VanZandt disappears one night in Hermosa Beach, Calif.; police suspect a group of strangers may be involved, while VanZandt's loved ones are haunted by suspicions about his thrill seeking make-up.

Summary: Ali Lowizter, 16, vanishes after getting off her school bus; the investigation stalls for two years until a tip comes in claiming Lowizter could have been trafficked, leading to a SWAT team raid on a house of prostitution.

Summary: Thirteen-year-old Tabitha Tuders vanishes while walking to her bus stop in Nashville, Tenn.; police think she's a runaway, but there are disturbing circumstances surrounding her disappearance, leaving her family desperate to find the truth.

Summary: Nineteen-year-old college sophomore Martin Roberts is a popular fraternity brother, then he goes missing, leaving behind a cryptic note; two years later, Roberts' family remains desperate to know what happened to him.

Summary: When 70-year-old retired firefighter Michael Chambers goes missing, a bloody crime scene in his garage indicates foul play; then, authorities begin to believe that the crime scene may have been staged.

Summary: Nancy Moyer isn’t home when her kids come back from visiting their dad. Police look into her background, and find a more complicated life than anyone knows. But when a random murder occurs nearby, the question becomes could the cases be connected?