When young Arthur Conan Doyle is offered a place at Baskerville Hall, a secret school for exceptionally gifted children, he is delighted. Now he has a chance to change his family's fate. However, his joy is overshadowed by disturbing events. Arthur faces deadly enemies who want him expelled... or worse. But the boy also finds friends! Irene Eagle, a brave girl who is always ready for action, and Jimmy Moriarty, a boy whose intelligence and powers of observation are equal to Arthur's. Together, they must pass three difficult tests to join the Trillium, a powerful secret society. Along the way, the friends discover that their new school is full of secrets just waiting to be uncovered.