Jimmy, a whiz kid and a friend of Gloria's, is ushered away by a strange trio of villains. Gloria tries to convince Tucker that Jimmy has been kidnapped, but Tucker does not become suspicious until two goons lock him in a closet.
Sgt. Tucker Pendleton's friend, world famous pianist Paul Farrow, who is secretly involved in an international jewel heist, falls for Gloria and persuades Tucker, a violinist, to appear with him in concert.
Tucker is assigned to guard Captain Lombardi, the star witness in a gangland murder trial, from assassins who want to keep him from testifying. Lombardi's death is staged for the press to protect him from a hit man.