It's the summer of 1939: three friends, three bikes, the seaside and the pier, and school holidays that seem to last forever... Hannah, Peter and Jack know that their country may be going to war very soon, but they have no idea of what that will mean for them and their families. Jack's brother is a soldier, Peter's father a policeman. Already, the children have gas masks to take to school and have been building shelters. For a while, the war seems like an exciting adventure. There are spies to look out for, there's shrapnel to collect, and talk of invasion is almost thrilling. But when war comes close, very close, and that's a different story..