Mortal bonds
(Book)

William von Becker ran one of the largest privately held investment banks in North America, until the bottom fell out and the whole edifice was demonstrated to be a hollow shell, a fraud. After von Becker dies in prison -- though whether by sucicide or something more sinister, no one is exactly sure -- financial investigator Jason Stafford is hired by his family. There is still a lot of missing money out there, he's told, and they want Stafford to find it before the Feds do -- and certain other parties, some of whom are nowhere near as scrupulous in their methods. Bad things start happening to the people Stafford talks to. Soon bad things are happening to him as well.