When Sherlock Holmes and Dr. Watson are summoned to investigate a mysterious death at Holyroodhouse Palace in Edinburgh, the case arrives through an unusual channel—Holmes’s influential brother, Mycroft Holmes. Acting on behalf of the British government, Mycroft hints that the matter may have implications far beyond a single crime.

At the palace, Holmes and Watson uncover a chilling mystery tied to the violent history of Mary, Queen of Scots. The victim’s death mirrors a centuries-old murder, and as Holmes follows a trail of cryptic clues, it becomes clear that someone is reviving the past with deadly precision.

With quiet pressure from Mycroft and the weight of history closing in, Holmes must unravel a case where politics, legend, and murder intertwine. Atmospheric and suspenseful, The Italian Secretary brings the Holmes brothers into a dark and intricate tale where the past refuses to remain buried.