Foreshadowing

It is 1915 and the First World War has only just begun.
17 year old Sasha is a well-to-do, sheltered-English girl. Just as her brother Thomas longs to be a doctor, she wants to nurse, yet girls of her class don't do that kind of work. But as the war begins and the hospitals fill with young soldiers, she gets a chance to help. But working in the hospital confirms what Sasha has suspected--she can see when someone is going to die. Her premonitions show her the brutal horrors on the battlefields of the Somme, and the faces of the soldiers who will die. And one of them is her brother Thomas.
Pretending to be a real nurse, Sasha goes behind the front lines searching for Thomas, risking her own life as she races to find him, and somehow prevent his death.

"From the Hardcover edition."