A writer bets a publisher friend that he can write a 10,000-word novel in 24 hours. The publisher takes the bet, and gives him the "only key" to his Baldpate Inn, which has been closed for the winter, so he can write in complete seclusion. Things start heating up, though, when a succession of people who also have keys to the inn begin showing up.

Tarzan and Jane are traveling to Paris to help his old friend Countess de Coude, who is being threatened by her brother, Nikolas Rokoff. Rokoff has Tarzan tossed overboard. He survives, comes ashore in North Africa, and goes to Paris to search for Jane. In Paris, Tarzan reunites with his old friend Paul D'Arnot, who informs him that Jane was taken to Africa. Tarzan returns just in time to save Jane from a lion attack, and soon defeats Rokoff and his henchmen.