Tropic Madness: Herbert Pomeroy's wife Juanita spends his money extravagantly and irresponsibly, finally driving him to bankruptcy. Desperate, he sends his son Frankie to live with his friend Henderson, a South Seas trader, then commits suicide. Although Juanita spends years searching for her son, she finally gives up and takes a world cruise on the yacht of wealthy Jules Lennox. One day the yacht docks on Henderson's island and Juanita, meeting Henderson, persuades him to let her be Frankie's governess. Complications ensue, involving a poor physician, a jealous island woman and a witch doctor.