In this second book of the Satan and Iscariot trilogy, the story begun in The Rock Castle continues. Winnetou and Old Shatterhand try to find out what has happened to the missing German immigrants and, at the same time, pursue the criminal mastermind Harry Melton and his cohorts. The trail leads into the middle of the Sierra Madre mountains, as they try to find the Rock Castle and discover its secrets. Finally justice prevails, only to be blinded once again by Melton`s friends and family, and this takes Winnetou and Old Shatterhand through the San Francisco of the 1880`s and on to Germany. Finally they find themselves in various precarious situations in the deserts of Tunisia, in pursuit of the Swindler of the Miilions, a pursuit that will culminate in the final book of Satan and Iscariot, to be published in 2009.