In the third and final of their real-world/latter-day twisty-thriller teamings for Hammer, Francis and screenwriter Jimmy Sangster weave a tangled web as American amnesiac Robert Webber finds himself recuperating in an English hospital following an auto accident—but unsure of who or what to believe, as an enveloping murder plot reveals itself. With Anthony Newlands, Jennifer Jayne, Lelia Goldoni, Sue Lloyd, and Maurice Denham.

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