When P.J. Morse describes her novel, “Heavy Mental,” as “Not Your Nana’s Cozy,” she means it. Clancy Parker plays guitar for the Marquee Idols and also solves mysteries as a private detective. She’s used to your run-of-the-mill adultery cases, so she’s intrigued when a San Francisco socialite offers her a case of a different kind: She needs help finding a very expensive missing necklace. I don’t want to give too […]