Newbery Honor-winning author Gennifer Choldenko returns to Al Capone's Alcatraz in this winning addition to the beloved series. Moose and his sister Natalie are growing up, and the stakes on the prison island are higher than ever. Moose Flanagan lives on a famous island in California: Alcatraz, home to some of the most dangerous prisoners in the US in the 1930s. His dad works there. It's the summer before starting high school and Moose is going to play a lot of baseball, and win a spot on the high school team. But he still needs to watch his special older sister Natalie, and now, the warden asks Moose to look after his two-faced, danger-loving daughter, Piper. In the cell house there are rumors of a strike, and that Moose's father might step up to new job. Moose is worried: what will this mean for their family, especially for Natalie, who's had some scary run-ins with prisoners? Then the unthinkable happens: Natalie winds up someplace she should never, ever go. And Moose has to rescue her.