This sleek, efficient little thriller won't let go once it gets its claws in ya! I read Feral (Pocket Books, 1975/Avon reprint, 1983) in one lazy, sunny, mildly hungover afternoon, eagerly eating up every gruesome morsel Berton Roueché was serving. First time I ever heard of it was in King's Danse Macabre, in which he writes it's "one of that select handful [of books] that I have given to people, envying them the experience of the first reading." Indeed. Feral is a soufflé of a…