After her husband dies, Lydia Krause sells her company and moves to an upscale retirement community on Long Island to start a new life. At her first Twin Lakes event, she meets the community’s financial advisor, whom she recognizes as the convicted embezzler who drove her sister to suicide. After exchanging heated words with the man's wife, Lydia flees the scene. When the woman is found dead the following morning, Detective Sol Molina considers Lydia Suspect Number One.
Lydia undertakes an investigation to clear her name. More Twin Lake residents are murdered, and she’s determine to find the killer. At the same time, she must deal with issues concerning her two daughters. Her younger daughter surprises her with news that she’s engaged and planning to move to England. Her married older daughter appears to be having an affair with an old boyfriend, the very person who might be the Twin Lakes killer. Romance is in the air as Lydia and Detective Molina spar then join forces to stop the murderer before Lydia becomes Victim Number Three.