Captain Hugh "Bulldog" Drummond is called in to solve the murder of a man from whom two lead soldiers were stolen. Drummond learns that the two soldiers were part of a set of thirteen which formed the key to a hidden vault of treasure. Following some clever sleuthing and set-up on Drummond's part, the guilty man is trapped in the vault,which is hidden behind the fireplace.

Shipping magnate Cyrus Wentworth, downcast over a disaster to his ocean liner 'Wentworth Castle' (carrying, oddly enough, an illicit shipment of Chinese bonds) is shot in his office at the very moment of kicking out his daughter's fiance Dick Fleming. Of course, Captain Street arrests Dick, but reporter Bobbie Logan, the attractive thorn in Street's side, is so convinced he's wrong that she enlists the help of detective James Lee Wong to find the real killer.