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...

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.