What if young Arthur Conan Doyle really went to a secret school for extraordinarily gifted children called Baskerville Hall? When a mysterious man with a pipe notices young Arthur’s incredible deductive skills, Arthur’s offered a spot at the esteemed Baskerville Hall and a chance to lift his family out of poverty. There Arthur makes quick friends with Irene Eagle, a girl who boldly strides into any adventure and Jimmie Moriarty, a boy whose brilliance rivals Arthur’s own. But he makes enemies, too, who want Arthur expelled . . . or worse.

Soon Arthur and his friends (and enemies!) are invited into a powerful secret society called the Clover. In order to be accepted into the illustrious social club, they must pass three tests, but along the way, Arthur uncovers a mystery that will lead to grand adventure . . . and even greater danger. Arthur will need all the help he can get to solve the puzzle and keep a shocking truth from falling into the wrong hands. Meanwhile, he will finally meet the man who becomes his greatest mentor: Professor Sherlock Holmes.