In 2003, Rebecca Whitaker died in a road accident. Her husband Mark receives a battered envelope, sent eight years earlier, containing a set of instructions and a letter with a simple message: "You can save her." Later that night, Mark glances at a security monitor, only to see himself - and behind him a stone statue of an angel, covering its eyes as if weeping. Yet, when Mark turns, there's nothing to see. As Mark is given the chance to save Rebecca, it's up to the Doctor, Amy and Rory to save the whole world. Because this time the Weeping Angels are using history itself as a weapon.
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