When a platoon of Korean War G.I.s is captured, they somehow end up at a ladies garden club party. Or do they? Major Bennett Marco (Frank Sinatra) can't remember. As he searches for the answer, he discovers threads of a diabolical plot orchestrated by the utterly ruthless Mrs. Iselin (Angela Lansbury) and involving her war hero son (Laurence Harvey), her senator husband (James Gregory) and a secret cabal of enemy leaders.