

Holmes unravels espionage, betrayal, and murder to recover stolen submarine plans and protect Britain.
When a body turns up on the London Underground clutching a set of stolen naval plans, Sherlock Holmes is drawn into a compact, high-stakes mystery that hums with political urgency. Tasked by Mycroft himself, Holmes and Watson navigate a maze of subtle clues, shadowy encounters and patriotic secrecy as they chase the Bruce-Partington plans that could shift the balance of power. Taut, clever and morally keen, Doyle’s tale pairs brisk detective work with atmospheric London detail, offering a race against time and a masterclass in observation that keeps readers guessing until the final, satisfying reveal.