Albuquerque, N.M., mail carrier Marilyn Gandert disappears for days and no one knows where she has gone; when her body is found in the desert, detectives must find the murderer, and they only have a few witnesses beyond Marilyn's family members.

When devoted mother Danielle Pruett goes missing in Tazewell, Virginia, police launch an investigation to find her. But when her lifeless body is discovered in an open field, what starts as a web of lies and deceit becomes a race to track her killer.

Steven Galvin is dead; now, bodycam video captures the detectives' hunt for his killer; as the case unravels, a surprise witness turns the case on its head; and a play by play of the crime reveals new evidence that brings the killer to justice.

Agnes Bram, an 82-year-old Middleton, Wis., woman is found murdered in her garage; as detectives develop their case, a city-wide manhunt follows, and investigators must curb public hysteria by ensuring the killer will not kill again.

Ryne Zahner is an inspiration to his high school math students in Arizona; his friends see him as one of the nicest people they know; a hooded murderer guns him down after a night of partying and the entire community struggles to grasp his murder.

Madison Wells, a 16-year-old student in New Jersey, is found murdered in her aunt's kitchen; when police look into her relationship with a 20-year-old, they go down a rabbit hole that exposes an abusive relationship that leads to a tragic death.