Charlie has been having nightmares. It's been this way for a few years—since German bombs rained down on London, taking his father's life, taking his city's spirit, taking his beloved brother, Theo, off to war in France. Now, Charlie is left to take care of his Grandpa Fitz while his mother works, waiting for the day, now that the World War II is almost won, when Theo will come home. Grandpa Fitz warns him that soldiers sometimes come back missing a piece of themselves, but Charlie isn't worried. Whatever Theo has lost, Charlie will help him find it. When Theo finally does return, he is sick, and cold, and distant. Their family, like the city itself, feels more broken than ever. But Charlie refuses to accept that the brother he knew is gone, and soon, he discovers the reason for his brother's change: War Wolves. Terrifying ancient beasts who consume the hearts of those broken by grief and loss. The Wolves have followed Theo and hundreds of other soldiers home from the front. If Charlie truly wants to save his brother, he's going to have to confront the Wolves, and the conflict inside himself. But can a heart that's been eaten ever be replaced?