Terror lurks beneath the streets of London....

Marcus Mortlake is haunted by the past. No matter how many supernatural menaces he defeats, it is never enough. He is still tortured by nightmares, memories of those he failed to save from a diabolical cult years ago - including Cassandra, the woman he loved....

When Mortlake is linked to a series of grisly murders in fog-shrouded London, he is once again compelled to investigate. And what he discovers is a shocking supernatural mystery beyond imagination. Victims, drained of blood, and a series of kidnappings that fit a very select profile.... The targets all possess some degree of psychic power.

After one of Mortlake’s closest friends goes missing, the case becomes even more personal. The trail of clues leads from the city streets to the dank sewers deep below. And Mortlake must come face-to-face with his deadliest adversary...a man he thought had already died.

But this villain is aided by a powerful entity from Mortlake’s past. Something that knows exactly how to hurt him the most....

Will Mortlake survive? Or will his past plague the present?