Jelly's Gold (Rushmore McKenzie) by David Housewright

Rushmore McKenzie, rich ex-cop, is asked by an old female friend to help out with a special treasure hunt... To find the lost gold of thirties gangster Frank Nash. When people starts dying McKenzie learns everybody wants the gold and some people will do anything to get it.
Not only is this the story of McKenzie's hunt but also an interesting look at the St. Paul of the 1930's, a very interesting time for those interested in crime.
David does a good job in mixing this story (via letters, historical documents and eyewitness accounts) with McKenzie's investigation.
As always McKenzie is a very likable hero, always trying to what's right, living up to his personal code like Spenser does. In fact, for those who are tiring of reading the same Spenser-story over and over again this might be a great change of pace. Also, kudos to David for telling a PI-story without the more standard plots like looking for a missing child or standard homicides.