When Hammer arrests the leader of a Satanic cult, Internal Affairs insists that the cultist be allowed his one phone call. Soon after the cultist makes the call, the precinct headquarters is surrounded by hundreds of demented devil worshippers. With communications to the outside cut off, Hammer devises a risky plan to lift the state of siege.

Hammer is assigned to protect a Russian scientist who is being pursued by the KGB, leading to a cross country train journey fraught with peril.