
District attorney Catherine Chandler, after being attacked and left for dead, is rescued by a half-man/half-beast named Vincent who lives in secret caves and tunnels beneath New York City. When Catherine returns to the surface to resume her life, she and Vincent are not only in love, but share a powerful psychic bond that enables Vincent to sense whenever Catherine is in danger. The plotlines revolve around Catherine getting in danger and the dashing and powerful Vincent coming to her rescue.

The secret of the Tunnel World is imperiled when a troubled boy (Jonathan Ward) follows Catherine into its depths.

Vincent tries to help a disfigured outcast (Kevin Scannell) who is brought into the Tunnel World by Father's son (Bruce Abbott).

Catherine's loyalties are divided when she is assigned to prosecute a man who now lives as a respected member of the Tunnel World.

Elliot Burch, framed for Moreno's murder, is visited by Gabriel who promises a restoration of Elliot's wealth and power if he betrays Vincent.