Capt. Jack Murphy and his special squad are ordered to neutralize a secret coastal flamethrower installation, which may jeopardize the whole Operation Overlord. A key to silent infiltration lies in Lt. Strobel, an ex-Broadway performer and a master uniform swapper. Additional help will be provided by a female resistance fighter Denise. However, her aging father may not approve of her cooperation with so many American men and thus attempt putting passing Nazi motorcyclists on high alert...