On March 10, 1928, Christine Collins gave her nine-year-old son a dime for the movies and he never came home. Five months later, the LAPD called with good news: they'd found Walter. But the boy they brought her wasn't her son, and when she said so, they locked her in a psychiatric ward. What followed exposed a serial killer, a culture of institutional gaslighting, and a question that stayed open for the rest of Christine Collins' life: did they ever actually find Walter? Episode 24 of Still Unexplained explores the Wineville Chicken Coop Murders, Code 12 commitments, and one of the most haunting cold cases in Los Angeles history.

Two Brazilian electronics technicians were found dead on a remote hilltop in 1966, dressed in matching suits and raincoats, their eyes covered with crude shields cut from sheets of lead. A cryptic handwritten note beside them instructed them to "ingest capsules," "protect metals," and "await signal." Six decades later, no cause of death has ever been officially confirmed. Episode 23 of Still Unexplained explores the Lead Masks Case of Vintém Hill: the secret society of scientific spiritualists, the missing money, the UFO witness, and the forensic disaster that made sure we'd never know the truth.

In March 1922, six people were murdered on an isolated Bavarian farm. The killer stayed for four days, fed the livestock, ate from the pantry, and walked away without a trace. The Hinterkaifeck murders remain Germany's most haunting unsolved case, and more than a century later, no one has ever been charged. This episode covers the chilling weeks before the attack, the catastrophic failures of the investigation, and the four competing theories that each explain everything and prove nothing.