Something strange is going on at the Hereuse Nursing home on the Isle of Bute. One of the residents, Jessie McAdam, thinks her life is in danger. Alison Cameron, who is reluctantly arranging a college reunion on the island, agrees to find out what is causing her mother's old friend, Jessie, such concern. Before long Alison finds herself involved in a series of mysterious deaths. Meanwhile Alison's daughter, Deborah, has started a new job at the Regius Gallery, owned by an antiques dealer whose activities are suspicious. Can Alison find out what is happening before it's too late?