The Club — Jane Heller

When a golf club's first single female member is murdered, spunky club wife Judy Mills takes a swing at sleuthing in this “witty, well-plotted” mystery (Publishers Weekly).
 
Judy Mills has it all: A handsome husband, a thriving career, and a landmark house on two sylvan acres. But when Judy is downsized by her company, her husband suggests she networks with members at The Oaks, the country club he reveres and she abhors.
 
Judy knows the misogyny at the antiquated club is all par for the course, but she finds an unexpected ally in Claire Cox, a staunch feminist who has broken the club's ironclad rule against admitting single women. There are other things about The Oaks that Claire intends to change -- until she's found dead in a sand trap on the golf course.
 
When ruggedly handsome Det. Tom Cunningham asks Judy to secretly investigate, she agrees to shed the role of complacent club wife to become an amateur sleuth. One willing to risk her life to bring a killer to justice, and just maybe bring her golf-obsessed husband to his senses . . .
 
“Heller delivers perfect reading for the beach -- or pool-side at the club.” -- Publishers Weekly