In 2003, Rebecca Whitaker died in a road accident. Her husband Mark is still grieving. He receives a battered envelope, posted eight years ago, containing a set of instructions with a simple message: "You can save her." As Mark is given the chance to save Rebecca, it's up to the Doctor, Amy and Rory to save the whole world.
Jonathan Morris is the writer of the official Doctor Who Magazine comic strip, has written three Doctor Who novels for BBC Books and numerous audio adventures for Big Finish Productions and BBC Radio 7. He has also written for the TV sketch shows Dead Ringers and Swinging.