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.
Fortune, Ida Belle, and Gertie are finally off to Florida on the vacation they’ve always talked about. Days filled with white sand, turquoise water, and fruity drinks are the only thing on the agenda. But when Gertie’s “hot date” turns up dead and she’s the number one suspect, they’re forced to hang up their bathing suits and shift to investigating mode.
They soon discover that Gertie’s beau was up to all kinds of shady behavior, leaving them with a long list of people who are happy he’s dead. But which one resorted to murder?