When crooner Guy Lambert wraps his London show and travels to Brussels, two beauties secretly follow. One (Annette Day) is a lovestruck heiress, the other (Yvonne Romain) is an enigmatic temptress. And they could be too much for unattached Guy. Comedy, mystery and mayhem combine when Elvis Presley plays Guy in "Double Trouble, a romp involving stolen gems, trench-coated defectives that is, detectives!and more. Through it all, a guy's gotta do what a guy's gotta do. That means performing a tune array that includes the title cut, "City By Night, and "Could I Fall in Love? "Long Legged Girl and "There's So Much World to See. Trouble was never this cool and this much fun.