Le Docteur Jekyll effectue des recherches en se servant d’une matière très particulière . Bientôt, il va perdre tout contrôle et se transformer en Jack Hyde…
Tank is an investigative reporter and jailbird, framed on scant evidence supplied by the London mob. Helen is the sensuous call-girl who offers Tank ammunition and retribution. But, retaliation is swift and brutal, in the guise of Sir Robert Knights and his equally lethal lawyer, Dunboyne. A series of hideous murders follow as the devil protects his own. Only Malling and Helen can halt the onslaught. But, for how long, and at what price?