Summer, 1944. As Allied soldiers prepare to land in France, Marc and his friends must destroy a battalion of German tanks that could halt the invasion in its tracks. The tide of war has turned against the Nazis, but desperation has made them more brutal than ever. Henderson's Boys' final mission will be their most dangerous. With food and weapons in short supply, survival is the biggest challenge of all.

One of Henderson's best agents is being held captive in Frankfurt. A set of forged record cards could be his ticket to freedom but might just as easily become his death warrant. A vital mission awaits him in France - if he can find a way to escape.

Spring, 1941.German submarines are prowling the North Atlantic, sinking ships filled with the food, fuel and weapons that Britain needs to survive. With the Royal Navy losing the war at sea, six young agents must sneak into Nazi-occupied Europe and sabotage a submarine base on France's western coast. If the submarines aren't stopped, the British people will starve.

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.

Britain, 1941.The government is building a secret army of intelligence agents to work undercover, gathering information and planning sabotage operations. Henderson's boys are part of that network: kids cut adrift by the war, training for the fight of their lives. They'll have to parachute into unknown territory, travel cross-country and outsmart a bunch of adults in a daredevil exercise. In wartime Britain, anything goes.