Eagle Day (English, Paperback, Robert Muchamore)

Late summer, 1940.Hitler has conquered France. Now he intends to cross the Channel and defeat Britain before winter arrives.A group of young refugees led by British spy Charles Henderson faces a stark choice. To head south into the safety of neutral Spain, or go north on a risky mission to sabotage the German invasion plans.For official purposes, these children do not exist.
Source- Goodreads.com
E15