Waking up in Morocco with no memory of her identity, Mary Russell is enmeshed in the political and military uprisings of Europe, while Sherlock Holmes taps the assistance of T. E. Lawrence to restore Mary's memory and prevent a full-scale war that threatens countless lives.

While on a school trip to the British Arts & Antiquities Museum, John Watson and his friends from the Baker Street Academy get involved in a mystery when the Alpine Star, a famous diamond, is stolen.

It is 1895, and Sherlock Holmes?s new client is a High Court judge, whose free-spirited daughter has disappeared without a trace. Holmes and Watson discover that the missing woman?Hannah Woolfson?was herself on the trail of a missing person, her close friend Sophia. Sophia was recruited to a group known as the Elysians, a quasi-religious sect obsessed with Ancient Greek myths and rituals, run by the charismatic Sir Philip Buchanan. Hannah has joined...

London, 1943. Across the city, prominent figures in science and the military are bursting into flame and being incinerated. Convinced that the Germans have deployed a new terror weapon, a desperate government turns to the one man who can track down the source of this dreadful menace--Sherlock Holmes. The quest for a solution drives Holmes into an uneasy alliance with the country's most brilliant scientific genius, Professor James Moriarty. Only Sherlock...