The Tropic of Stupid by Tim Dorsey
Serge Storms is a lover of history, so he’s decided to investigate his own using one of those DNA services. Excited to construct a family tree, he and his perpetually stoned friend Coleman hit the road in Florida to meet his kin.
But as the old saying goes, the apple doesn’t fall far… Serge is thrilled to discover he may be related to a notorious serial killer who’s terrorized the state for twenty years and never been caught. Which one of his newfound relatives will be the one to help him hunt down this deranged maniac? Serge doesn’t know that a dogged investigator from the Florida Department of Law Enforcement is also hot on the trail.
Then Serge meets a park ranger who’s also longing to make a family re-connection. But all is not as it appears on the surface, and Serge’s newfound friendship in the mysterious swamps of Florida may lead to deadly results.