Several extremely rich men have died under suspiciouscircumstances, and Karl Zweig, a professor of philosophy, has reason tosuspect they were murdered by his former student, Gustav Neumann, abrilliant young man who had once espoused the desire to become a mastercriminal. When he observes Neumann in the company of Sir TimothyFerguson, a wealthy and sick old baronet, Zweig believes he may soon beNeumann's next victim. But as Zweig races to gather evidence against hisold friend, he begins to be unsure whether any murders have beencommitted at all. Instead, Neumann may be involved in something evenmore disturbing and bizarre than anyone could ever imagine . . .First published in 1964,Necessary Doubtis a suspenseful and page-turning thriller that reflects Colin Wilson'slifelong interest in crime and murder and explores intriguing questionsof existential philosophy. This edition is the first in more thanthirty-five years and features a new introduction by Colin Stanley.