Bobby loves his dog King, a playful German shepherd...until the day King turns and attacks him, snarling and vicious. The dog is put to sleep, but Bobby still sees him everywhere--in the garden, on the stairs, crouching, waiting.

Then the horrific deaths begin--brutal, savage maulings. Terror grips the sleepy town of Fallsburg, and doors are nervously locked at night. For through the woods runs a dark shadow with dripping jaws, eluding pursuit with uncanny skill.

Now, more than ever, the scientist down the road must guard the deadly secret of the monster they've unleashed.