The trendy elegance of director Douglas Sirk's later big-budget soap operas is nowhere to be found in Sirk's Atomic-Age melodrama Mystery Submarine. MacDonald Carey stars as Brett Young, a U.S. undercover agent whose job it is to prevent atomic secrets from falling into the wrong hands. Marta Toren co-stars as Madeline Brenner, a woman of mystery who is seemingly in cahoots wit...