The Undertaking - Audrey Magee

Desperate to escape the Eastern front, Peter Faber, an ordinary German soldier, marries Katharina Spinell, a woman he has never met; it is a marriage of convenience that promises 'honeymoon' leave for him and a pension for her should he die on the front. With ten days' leave secured, Peter visits his new wife in Berlin; both are surprised by the attraction that develops between them.