After escaping from the headhunters village, Bomba brings Casson and Sobrinini to stay at his friend Pipinas after which Sobrinini reveals vital information to Bomba about his family and tells of a man, Japazy, who hated Bombas father as well as Cody Casson. She tells Bomba to seek out Japazy on Jaguar Island to learn more. He begins his journey to find Japazy... Lacking the visual element, the book focuses on vivid descriptions of Bombas rippling muscles and superior strength. Bomba, the Jungle Boy on Jaguar Island? 4 in the Bomba series, by Roy Rockwood, was published in 1927. Roy Rockwood, the author, was a house pseudonym used by the Stratemeyer Syndicate for boys adventure books, many of the Bomba books being ghostwritten by John William Duffield (1859 1946).