Fun regional mystery series you may have missed: Dead Tease: A Loon Lake Mystery by Victoria Houston

From Library Journal: "The small population of Loon Lake, WI, wouldn't seem to lend itself to hit-man murders, but there you have it. Jen Williams has just left a clandestine tryst with the local hospital's executive, John McNeil, when she is knifed at her own mailbox. Sheriff Lewellyn "Lew" Ferris once again employs her deputized friend, retired dentist Paul Osborne, to help her figure out who the two-legged loon is, in this tale of jealousy and revenge. She has her hands full interviewing a full deck of suspects, including McNeil's jilted lover, his wife, and a crazed old widow. Perhaps there's a touch of Columbo about Lew's team, but don't underestimate this small-town squad. A delightful procedural that makes the most of the series' offbeat ensemble cast."