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 World War II has transformed London. All the adults are busy 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, even including an obstacle course. They create helmets from cardboard and pretend rifles from old bits 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. Follow their adventures in 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!.