From internationally best-selling author Niccolo Ammaniti, comes a funny, tragic, gut-punch of a novel, charting how an unlikely alliance between two outsiders blows open one family's secrets. Lorenzo Cumi is a fourteen-year-old misfit. To quell the anxiety of his concerned, socially conscious parents, he tells them he's been invited on an exclusive ski vacation with the popular kids. On the morning of the trip, Lorenzo demands that his mother drop him off before they arrive at the train station, insisting that his status will be compromised if he shows up accompanied by his mother. Reluctantly, she agrees, and as soon as she is safely out of the vicinity, he turns around and makes his way back to his neighborhood, to put his real plan in motion: for one blessed week, Lorenzo will retreat to a forgotten cellar in his family's apartment building, where he will live in perfect isolation, keeping the adult world at bay. But when his estranged half-sister, Olivia, shows up in the cellar unexpectedly, his idyll is shattered, and the two become locked in a battle of wills--forced to confront the very demons they are each struggling to escape.