Sadistic killer-for-hire Philip Raven becomes enraged when his latest job is paid off in marked bills. Vowing to track down his double-crossing boss, nightclub executive Gates, Raven sits beside Gates' lovely new employee, Ellen, on a train out of town. Although Ellen is engaged to marry the police lieutenant who's hunting down Raven, she decides to try and set the misguided hit man straight as he hides from the cops and plots his revenge.

When American newspaperman and adventurer Henry M. Stanley comes back from the western Indian wars, his editor James Gordon Bennett sends him to Africa to find Dr. David Livingstone, the missing Scottish missionary. Stanley finds Livingstone ("Dr. Livingstone, I presume.") blissfully doling out medicine and religion to the happy natives. His story is at first disbelieved.