Murder at the Book Group by Maggie King

For fans of Anne Canadeo comes a fun and sassy cozy mystery in which one woman must solve the murder of a book group member and untangle a web of secrets hidden by her bookish cohorts.
Hazel Rose never dreamed that the murder mystery book group she and her friend Carlene started would stage a "real "murder.
Nevertheless, on the night when the normally composed Carlene seems unusually angry and rattled, during group discussion she dies after drinking cyanide-spiked tea. Despite a suicide note, Hazel is skeptical; Carlene never seemed suicidal--why else would she make all those plans for her future? Incidentally, Carlene was married to Hazel's ex-husband, and Hazel has always suspected there might be something more to her past than she let on.
How much does anyone really know about Carlene Arness? And did she die by her own hand or someone else's? Hazel begins a search for the truth that produces no shortage of motives, as she unearths a past that Carlene took great pains to hide. And most of those motives belong to the members of her very own book group...
Featuring memorable characters and a wicked sense of humor, "Murder at the Book Group" shows the darker side of a book club where reading isn't about pleasure--it's about payback.