The Peanut Butter Murders — Corinne Holt Sawyer

The dead man was a mere fifty, too young to have much in common with the well-heeled oldsters at the beautiful Camden-sur-Mer retirement community in southern California. His death looks like an accident, but when those ever-alert senior sleuths Angela Benbow and Caledonia Wingate discover that he was courting one of their neighbors, they can't help hoping they'll luck into a nice murder investigation.

A second murder confirms their suspicions that a dangerous killer is on the loose. But between Angela's shameless curiosity and Caledonia's blitzkrieg, a mere murderer hasn't a chance. Unless he can eliminate them, too....