Anne Gibson is alarmed when identity thefts leave elderly Blue Hill citizens with bank accounts drained and credit cards maxed out. When a mysterious young woman arrives at the library's first book club meeting and starts asking personal questions of Anne's friend Mildred Farley, Anne wonders if the stranger is behind the thefts. As Anne sets out to uncover the truth, she discovers that there is far more behind the woman's curious behavior than she could have imagined.

Meanwhile, when Anne learns that her parents can't come for Thanksgiving, she and her children plan a big dinner at the library for their new friends. But will their guests' last-minute cancellations make the family's first Blue Hill Thanksgiving a lonely one?