"An entertaining confidence game, which seduces, startles, and ... assuredly succeeds in engaging one"s interest." - Kirkus Reviews "[Wilson] continues to try to find out what is really important in life ... surely his intentions deserve all our respect. And by the way, Necessary Doubt is also quite a good thriller." - Times Literary Supplement "A grippingly readable suspense story." - The Observer Several extremely rich men have died under suspicious circumstances, and Karl Zweig, a professor of philosophy, has reason to suspect they were murdered by his former student, Gustav Neumann, a brilliant young man who had once espoused the desire to become a master criminal. When he observes Neumann in the company of Sir Timothy Ferguson, a wealthy and sick old baronet, Zweig believes he may soon be Neumann"s next victim. But as Zweig races to gather evidence against his old friend, he begins to be unsure whether any murders have been committed at all. Instead,...