Agnes Ayers co-stars with Antonio Moreno, Tyrone Power, and Louis Wolheim in this early science fiction saga. When a scientist invents a radio-controlled death ray, a notorious bootlegger tries to steal the weapon. The inventor and his sweetheart are marooned on a desert island in the Caribbean. The scientist tries desperately to contact the Navy to head off the gang and warn the President of the danger to national security. Dagmar Godowsky, Jack Bohn, and Maurice Costello also appear in this implausible but entertaining melodrama.