The Retirement Plan by Sue Hincenbergs

Friends Pam, Nancy, Shalisa, and Marlene are still working in their sixties, with retirement just a dream. Their husbands lost all their money in an investment that Hank, Pam's husband, suggested they participate in. When one of the husbands dies, it sets in a motion a plan that involves the women hiring a hitman to kill their husbands. In turn, the men have secrets of their own that they've been hiding. The Retirement Plan is a lighthearted novel focused on who can come out on top to grab all the riches--and stay alive.