A deftly crafted, scintillating mash-up of Victorian mystery and horror—Sherlock Holmes and Mr Hyde encounter villains with unfathomable, terrifying abilities.

1903. A darkness has descended on London. A series of grisly murders are uncovered, trophies taken, bodies arranged, and soon there are whispers of Jack the Ripper’s return.

A new client arrives at Baker Street seeking Sherlock Holmes’s help: Dr. Jekyll claims his friend has been wrongfully accused of the hideous crimes, a friend called Mr. Edward Hyde, whose very existence relies on a potion administered by the doctor himself.

But the case becomes more complicated, more unsettling than simply proving Mr. Hyde’s innocence—for Holmes and Watson unearth beastly transformations, a killer who moves unseen, a secret organization, and then find a traitor in their midst.