When 12-year-old twins Alexander and Cleopatra’s father disappears, they join the Black Hook Gang and are caught by the police pulling off a heist. They agree to reveal the identity of the gang in exchange for tickets to New Orleans. But once there, Alex is shanghaied to work on a ship that is heading for San Francisco via Cape Horn. Cleo stows away on a steamer to New Granada where she hopes to catch a train to San Francisco to find her brother. Neither Alexander nor Cleo realizes the real danger they are in — they are being followed by pirates who think they hold the key to treasure. How they outwit the pirates and find each other makes for a fast-paced, breathtaking adventure.