"Will leave you dying to know more."--Rick Riordan, author of the Percy Jackson series

The New York Times bestselling author of the Peter and the Starcatchers and Kingdom Keepers series, Ridley Pearson, brings us the riveting first tale of the Lock and Key trilogy about the origins of the rivalry between literature's most famous enemies--Sherlock Holmes and James Moriarty, told from the perspective of James's observant little sister, Moria.

Before James grew up to be a ruthless, remorseless villain, he was a curious boy from Boston, with a penchant for...