“Residue” by Michael McGarrity (Norton). In a dozen other Michael McGarrity mysteries, Kevin Kerney has solved some tough crimes, often at peril to himself. But nothing has threatened him as much as an unsolved murder in “Residue.” That’s because Kerney himself is the primary suspect. Kerney, retired Santa Fe sheriff, is attending a retirement party for his army wife, Sara Brannan, when he’s arrested for a decades-old murder.