I just rewatched "The List of Adrian Messenger" (for the first time in a long time). If anyone wants to see a good old-fashioned whodunit with a few surprises this is a good choice.

Made in 1963 it stars George C. Scott as a retired intelligence officer investigating the death of a friend. Its a little dry but cameo appearances by Burt Lancaster, Tony Curtis, Robert Mitchum and Frank Sinatra add to its appeal. Kirk Douglas rounds out the cast.

Its not shown much on tv (unfortunately) and I don't think its available on DVD but if you can get a VHS copy (library?) you should be happy you did.