MILLION DOLLAR THEFT IN SAN FRANCISCO A2-B1 STEP 2

Two years have passed since Susan, Brian and Jim solved a baffling mystery in San Francisco. This time they have to solve a million dollar mystery: Mark Twain’s secret diary has just been discovered and publishers all over the world want to get their hands on it… but it suddenly disappears without a clue! Susan, Brian and Jim are determined to find it.