A treasury agent on the trail of counterfeit money confides to fellow ocean liner passenger Charlie Chan that there have been two attempts on his life.

A public defender enlists Charlie to exonerate one of his clients, an ex-con falsely accused of bank robbery and murder, scheduled for execution in nine days.

Soon after a Chinese princess comes to the US to buy planes for her people, she is murdered by a poison dart fired by an air rifle.

Charlie Chan is an agent of the U.S. government assigned to investigate the mysterious death of an inventor.

Charlie Chan investigates the locked-room murder of a chess expert.

Charlie Chan looks into the apparent murder of a scientist in a spooky mansion.

A treasure map in four pieces, the ghost of a hanged pirate, a talking parrot, and a ship full of red herrings complicate Charlie's search for a murderer on board a docked ship.

Hired to investigate forged bonds, Charlie is thwarted by the murder of his undercover agent, but the arrival of son Lee helps him uncover the true culprits.

Charlie searches for a murderer amidst numerous ghosts conjured up by a strange variety of spiritualists and occultists.

Charlie discovers a scheme for the theft of government radar plans while investigating several murders.

Someone is attempting to steal radium stored in a bank. Death by cobra venom connects a number of murders. Charlie investigates.

While Charlie is distracted with the birth of his first grandchild, son Jimmy impersonates his father in order to investigate a murder aboard a freighter in the harbor.