U. S. Secret Service agent Burke is assigned to capture a gang of thieves attempting to smuggle valuable jewels from Cuba into the United States. Helen Morgan, a member of the gang, secretly loves Burke but ignores his entreaties to abandon her life of crime. Sylvia Ellis, whom Burke had befriended in Cuba, receives a box of candy from Helen, unaware that it contains the stolen jewels. On a steamship to Florida, Helen convinces Sylvia that Burke is a thief after the agent searches her cabin. Burke falls overboard during a fight with Helen's gang, and the ship lands with the jewels still in Sylvia's possession. After Helen invites Sylvia to her home and recovers the loot, Burke reappears to inform her of Helen's deception. Another battle with the gang ensues, and Helen is killed while trying to save Burke's life. Once the case is solved, Burke and Sylvia marry.—AFI