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Sam is sixteen - and fighting a war with his own body. For Sam, diagnosed with an incurable illness that gives him only months to live, time has suddenly become very important as he now has so little left. And nearly a hundred years ago, another Sam - a lieutenant in the British Army - is off to fight a different kind of war, on the Western Front. He knows that he may well not survive. Linking the two is a girl named Marion. But is Marion just a figment of Sam's imagination - a hallucination caused by his medication - or something far more extraordinary? Could she somehow be . . . a bridge across time itself?