Moose lives on Alcatraz Island, home to the notorious prison and the infamous gangster, Al Capone. But living right down the street from theives and murderers is not Moose's only problem. His Dad's always working and his mum expects him to look after his autistic sister, Natalie. And when Moose gets mixed up with Piper, the warden's daughter, he soon finds out that life on Alcatraz in far from straightforward.