Scotland Yard's Ian Rutledge finds himself caught in a twisted web of vengeance, old grievances, and secrets that lead back to World War I in the nineteenth installment of the acclaimed bestselling series. On the eve of the bloody Battle of the Somme, a group of English officers having a last drink before returning to the Front make a promise to each other: if they survive the battle ahead--and make it through the war--they will meet in Paris...