After being nabbed while trying to stow away on board an ocean liner en route to Hawaii, young Bobby Breen sings for his travel fare and, along with sidekick Pua, turns detective to recover stolen naval documents from crooks

Bobby Breen
as Billy Coulter

Ned Sparks
as Strings

Irvin S. Cobb
as Captain O'Hare

Gloria Holden
as Mrs. Milburn

Warren Hull
as Commander Milburn

Mamo Clark
as Hina

Raymond Paige
as Orchestra Director

Aggie Auld
as Hula Dancer

Cy Kendall
as Hawaiian Policeman

Herbert Rawlinson
as Mr. Harlow