Incubus — Ray Russell

Galen is an ordinary, peaceful small town. Until horrendous terror strikes … and strikes again and again, each time claiming a female victim in a fashion too hideous to contemplate. Julian Trask, student of the occult, is used to thinking the unthinkable. As he works towards the solution of the soul-searing mystery, Galen trembles in mortal dread. For no woman is safe from the lethal lust of THE INCUBUS.

In a small, sun-baked, seaside town, an ancient evil as risen

NO WOMAN IS SAFE FROM INCUBUS

You will not want to believe what it is and what it can do. You could not imagine how it must ultimately be exorcised.