The young doctor Dr. Virginia Larsen fights in vain against malaria on an island in the Antilles. She finally receives support from Dr. Dos Passos. The doctor persuades the rebellious natives to get vaccinated. They even help to dispel the suspicion of murder weighing on Dos Passos.
Scientist-explorer David Lynd leaves wealthy bride-to-be June Claymore at the altar to join photographer Andy Parker and British secret service agent Leo Marzeli in search of rare minerals.
A reporter investigates the murder of a showgirl, who was the widow of a millionaire. While digging in to the mysterious murder of a showgirl (Vivian Wilcox), intrepid reporter Bob Martin (Robert Lowery) uncovers a connection between that case and another one he's been working on.
Claude is a young man whose girlfriend has just broken up with him. Feeling unable to overcome the pain, Claude has no other idea than to end his life.
A counterfeiting gang implicate a bank employee in their crimes, but their cover-story about a ghost in the house where they do their printing backfires on them.