Join Jimmy and his friends in a new, action packed adventure series, specially designed for readers learning about World War II for the very first time! It's 1941 and the Second World War has transformed London. All the adults are doing important things and playing their part. Jimmy and his friends want to be in the thick of the action, doing whatever they can to keep the East End safe. So they form a top-secret group called the Cobb Street Commandos. Houses become hidden headquarters for official CSC meetings. Abandoned warehouses turn into their personal training grounds. They create helmets from cardboard and training tools from old scraps of wood. They know how to be creative and are more than ready for battle.

The only thing missing is a mission for them - until now, that is. Join Jimmy and his friends in action-packed adventures around the city as they raise money for Spitfire planes, train alongside soldiers and go on daring missions to meet the prime minister - Winston Churchill himself!.