Two years have passed since Susan, Brian and Jim solved a baffling case in San Francisco, and now they have to solve a million dollar mystery : where has Mark Twain's diary gone ? They are determined to find it and start looking into a dark secret from the 1850s and the wild days of the California Gold Rush... This reader uses the EXPANSIVE READING approach, where the text becomes a springboard to improve language skills and to explore historical background, cultural connections and other topics suggested by the text. As well as the story, this reader contains : Easy adaptation in American English Wide range of activities practising the four skills Preliminary-style activities and Trinity-style activities (Grade 4) Dossiers : Mark Twain in the Go.ld Country, San Francisco and the Gold Rush, Alcatraz Island Filmography Text recorded in full Exit test, keys and WEBACTIVITIES at www.blackcat-cideb.com