The Spinner — Doris Piserchia

The search for new sources of energy led one man to an accidental breakthrough into a strange parallel world. It was apparently deserted and might have been a good place to prospect until the finder panicked. He tried to shut the dimensional crack that led into that other place.

But the breakthrough had prematurely awakened that world's most predatory inhabitant from hibernation - and in raging fury THE SPINNER slipped through to find itself alone and hungry in an American city loaded with good things to eat - people!