A brand-new thrilling tale of madness, murder and reanimated corpses in the Cthulhu Casebooks series, where Sherlock and Watson fight the fiendish plots of the terrifying and alien Mi-Go, from the New York Times bestselling author.

It's 1929 and an ageing Dr John Watson, conscious of his imminent demise, finally sits down to write a fresh chronicle disclosing the true events behind his published accounts of Sherlock Holmes's exploits. In these pages, Sherlock Holmes and his stalwart companion encounter reanimated corpses in Highgate Cemetery; a very different, though ever elusive, Irene Adler; tales of madness and murder in the frozen wastes of the north; grotesque organic machines; and much more. Each case brings the illustrious pair ever closer to the dramatic and terrifying truth about the mysterious aliens, the Mi-Go, and their plans for Earth…