Watch Online Free FlixHQ. You're invited to the most exclusive event in all of London. Can Dr. Watson conceal a surprise party from the world's most accomplished detective? Can they keep their love hidden from disapproving Victorian eyes? Has Professor Moriarty come back from the dead to exact his revenge? Sherlock Holmes and the Adventure of the Furtive Festivity promises mysteries, mayhem, male-on-male action, and so much more.