The Road to Ruin (Donald Westlake)

Classic example of a Dortmunder story. He and his band of merry crooks devise a clever plot to steal the classic car collection from a sleazy ex-corporate executive who has ripped off everyone who ever had dealings with him. Unfortunately, several other groups have devised clever plots of their own. All these plots collide in the usual hilarious fashion. Lots of fun, and some great lines. (The executive is safe from the law because "You can't touch these guys, every one of them is surrounded by a moat filled with man-eating lawyers.")