THE FAN CLUB by IRVING WALLACE 511 pages. Simon & Schuster. $9.95.
The Great American Theme flourishing in recent film and fiction concerns the menopausal U.S. male who seems to be burdened by mortgages, a dismal sex life and fallen arches. This sad creature takes the holiday of his dreams, literally, combining hunting and fishing with other manly pursuits, e.g., rape, torture, kidnap and/or murder. Optional extras are sexual deviation, castration and severe mutilation, variously featured in such creations as James Dickey's Deliverance and David Osborn's more recent novel Open Season, a dreadful account of three top Detroit executives who each year...