Jenny Cooper Has a Secret by Joy Fielding

Linda Davidson, a widow, spends her days missing her husband and visiting her best friend Carol at Legacy Place, a memory care facility. On one visit, Linda meets Jenny, a ninety-two-year-old fellow resident, who tells Linda that she's killed several people. Not sure whether to believe her, Linda begins to visit with Jenny when she comes to Legacy Place. Jenny also reveal the names of the people she's killed--but is she telling the truth? A great read-alike for Hallie Ephron and Turn of Mind by Alice LaPlante.