A boxer is lured into a murder plot by a scheming woman.

Ace crime reporter Watling tries to discover the identity of a notorious jewel thief, but his informant is murdered. At a house party, Watling helps detective Adam expose the criminal.

As the Boer War ends a South African soldier hides a cache of diamonds he finds on a body. He returns to the town he left three years earlier where…

The crew of a submarine is trapped on the sea floor when it sinks. How can they be rescued before they run out of air?