The World of Hammer: Chiller

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Through the 1950s and 1960s, and running alongside production of the gothic horror films, Hammer made a series of what were known as "mini-Hitchcocks" mostly scripted by Jimmy Sangster, and directed by Freddie Francis and Seth Holt. These low-budget suspense thrillers, often in black-and-white, typically had a twist at the end of the tale. [Wikipedia]