Death Shall Overcome (A John Putnam Thatcher Mystery)

I'm a huge fan of Emma Lathen, and this is one of my two favorite books of all. Like all of her books, it is very witty (in some places, downright hilarious), and thoroughly enjoyable. The series features Wall Street bank executive John Putnam Thatcher and his colleagues -- and Wall Street banking was never that interesting when I worked there. Although I usually give away mysteries after reading them, this is one of only two series I keep and reread. I never tire of them.