When war comes to London in 1939, Ronnie Smith is scared and excited: scared of the bombs that fall that night, but excited to race his friends to collect the best bits of shrapnel every morning .

But for Ronnie, the battles aren't just in the sky and on the streets. Tneyr're at school and at home too. His little brother is up to no good with a secret job and dangerous new friends, and Ronnie's worried he's getting himself in big trouble. 

Ronnie's desperate to help his little brother. But he usn't expecting to uncover secrets that could change the fate of the whole war.