When an infant's body washes up on the shores of Deer Island, Massachusetts, residents rally to find out who she is, and what happened to her. Their unprecedented solidarity gets nationwide attention, helping police solve a heartbreaking mystery.

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On February 14th, 1929, one of the most shocking murders in mob history goes down in Chicago... and becomes known as the Valentine’s Day Massacre. The 20s and 30s are full of gangland murders, but the Valentine’s Day Massacre is considered the most brutal, and the toughest to solve. So who carried out the Valentine’s Day Massacre? And why?

Thank you to our experts who contributed to this episode: Clarence Goodman, Claire White, Natalia Mehlman Petrzela, Mike King, Cheryl Dorsey, and Larry Dale Gragg.

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The quiet Sarasota neighborhood of Mirror Lake wakes up to a nightmare when a neighbor is found strangled to death. Detectives believe it's the result of a long-held grudge against the silver tongued car salesman, but they turn out to be dead wrong.

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A historic Texan town is stunned when a popular caretaker is found dead and a beloved, wealthy resident goes missing. But with support from a concerned community, detectives uncover the deep rooted secrets that led to murder.

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A brutal double murder shocks Northern California's peace-loving and laid back Marin County. With residents reeling, police chase an elusive killer through three counties and multiple crime scenes to unravel a twisted tale of terror no one saw coming.

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Two former California cops go into business in the City of Angels' sleazy adult entertainment industry. But their partnership ends in a murder and a plot twist worthy of a Hollywood script.

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The gruesome murders of prominent Lynchburg couple Derek and Nancy Haysom in their own home, leads investigators on a path fraught with international flight and twisting confessions.

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Bitter divorce proceedings between Pilots Holly and Mike Mullins came to a sudden end when Holly’s dead body was found in a burned-out van.

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