TV Guide Investigation Discovery Monday

In 2016, 17-year-old Kianna Galvin leaves home to visit a neighbor and never returns. Nine years later, Detective Pam Childs investigates.

Arson investigators find a man dead in a burned-out home, and the police investigation quickly uncovers victim number 2; Detective Meroni must catch the killer.

A series of unsolved shootings and murders across Southern Florida leave a community terrorized under the threat of an unknown gang.

After 3 Texas teenagers vanish, they're found dead and details from a related robbery identify a suspect and the largest manhunt in state history is mobilized.

A mother is shot three times at a gas station in Memphis, Tenn., as police search for clues, a mysterious letter threatens to complicate the relationship.

79-year-old Lila Warwick was a loving and hands-on grandmother of eight, whose door was always open, until she opened her door to the wrong people in July 2013.

When 22-year-old LeAnne Martinez fails to pick up her daughter, her family worries, but what they find inside her mobile home will leave them forever scarred.

When Paula Cardwell returns from running errands, she finds her 20-year-old daughter lying dead on the kitchen floor, the town of Wetumpka, Ala., is stunned.

Detectives investigate in Grass Valley, Calif., after residents worry about their children's safety when two 16-year-old best friends disappear overnight.

Police investigate when an 18-year-old freshman at the University of Alabama disappears, which leads to fellow students on campus to fear for the worst.

Police investigate a brutal murder in the upscale community of Roswell, Ga., when a millionaire is discovered dead inside of his home.

A Staff Sgt. mysteriously vanishes in San Angelo, Texas, but investigators uncover a series of treachery and passion that ultimately led to his disappearance.

Police investigate after a successful entrepreneur is fatally shot in the parking lot of a building he once owned, in which several suspects are uncovered.

When a large & boisterous family moves in on a quiet street, neighbors immediately conflict with them over all the noise but soon the dispute consumes everyone.

Two unlucky neighbors bond over their struggles, but when one buries the other in debt with a hustle gone wrong, things fall apart badly.

Two rural families get along famously, until one claims the other's dog killed their goat, but then the dog goes missing and accusations fly.

A young couple moves to the country and ruins a quiet neighborhood, but loud parties and a junk-strewn lawn push the Vietnam veteran next door to build a fence.

A family moves one house over and when they start renovations, the noise and waste ignite a vicious feud between neighbors, ending in bullets and bloodshed.

A resident revives an HOA to beautify her community but some believe the organization is fraudulent; tensions escalate when liens are placed on a house.

A woman is murdered in the town of Winnsboro, Texas, and the ensuing investigation reveals this small town has a few wolves masquerading in sheep's clothing.

Single mother, Jennifer Brown, vanishes from her Limerick home and detectives race against the clock to find her. Her 8-year-old son asks where his mother is.

Three women bond over their love of Wicca and witchcraft, but one of them becomes convinced that a more powerful witch has placed a curse on them.

Single mother, Jennifer Brown, vanishes from her Limerick home and detectives race against the clock to find her. Her 8-year-old son asks where his mother is.

Three women bond over their love of Wicca and witchcraft, but one of them becomes convinced that a more powerful witch has placed a curse on them.

A woman is murdered in the town of Winnsboro, Texas, and the ensuing investigation reveals this small town has a few wolves masquerading in sheep's clothing.

Francis "Nicky" Nicolosi was found murdered on a 44-acre apple orchard, in September 2001 at the age of 75, but the police discover something more to the case.

Corinne Stoudt thought she had a second chance at love, but when she was found strangled to death in her home, her husband Calvin became a person of interest.