Film portrays the expedition of the British explorer David Livingstone to Africa to discover the source of the Nile, his disappearance, and the expedition to find him led by Stanley.
A retired Scotland Yard detective, Patrick Fitzpatrick (Tom Walls) comes back to take one final case, tracking down a missing vase which has been stolen by a gang of thieves specialising in taking art treasures.
Chet Kasedon is after the Indians hidden gold mine but Chief Moya will not reveal it's location. He has also hired mining engineers Gale and Mortimer to locate the mine.
Hoping to rid a small western community of its corrupt political machine, Ken Marshall (Ken Maynard) runs for sheriff against the bad guys' candidate and wins the election.
A newly hired police chief vows to clean up a notoriously corrupt police department. When he is murdered, investigators find that there is no shortage of suspects, most of them being fellow cops.