Would you break the rules or break your promise?On the outskirts of Edinburgh, just before the outbreak of WW2, Charlie finds a starving German boy called Josef hiding in the woods near his home.Josef can't speak English and is desperately afraid, especially of anyone in uniform. Charlie promises to help Josef find his Jewish relatives in the city.It's a journey that will force them to face their fears, testing their new-found friendship, and Charlie's promise, to the limit.