For over a decade during the 1940s and 50s, an unassuming man named John Christie was quickly becoming one of Britain’s most infamous serial killers. He hid the bodies behind the walls of his apartment, under the floorboards, and in the garden. But it’s not just the murders that makes this one of the worst in the country’s history. If you ever wondered why England doesn’t have the death penalty, it’s because of this horrific case.

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