On the frontline, the squad receives three new replacements straight from rear echelon duty in England. They are Gainsborough (a scared, overweight cook), Temple (an equally scared ex-ballet dancer), and Crown (a radio announcer whose cocky attitude masks his fear). Saunders reluctantly takes these newcomers on a dangerous recon mission and discovers that his survival depends on the ingenuity of these misfits.

While in a French town on leave, Hanley's leg is pinned by some debris during a bombing raid. In the church building with him is an undetonated German bomb which is still timed to explode. Help arrives in the form of an British demolition expert who is suffering battle fatigue and is angry at Hanley for trying to pickup his girl at a local bar.

A wounded Frenchman has important information. He and another man are injured when a land mind goes off. The squad takes refuge in a Convent of Cloistered Nuns. When Hanley arrives, he brings information that the medic died of a heart attack on the way. Saunders and Caje go to the village in search of the local doctor. The only doctor they find is a German doctor. They take him back with them.

A thirteen year old French boy wants to join the squad. After he is told he can't, he follows the squad. After Hanley is wounded, Caje tells him that he is now part of the group and his orders are to see that the Lt. gets back to town. When they get back to town, Lt. Hanley and the boy discover that the Germans are setting a trap for the Americans. Hanley sends the boy to find Saunders and the men and to tell Saunders about the Germans so he can radio the information to HQ.

Hanley is pulled off the line and sent to London. He discovers that he is to be used in a secret mission to aid a French physicist to escape occupied France before the Gestapo captures him. Hanley and the man's son were friends in college and Hanley spent one summer in France at the family's home. Hanley is the only man the scientist will trust, especially since it has been discovered that someone in the French resistance who is helping them is a double agent.