Librarian Greer Hogan is on hand to celebrate her old friend Sarah Whitaker's nuptials at the Whitaker summer home on beautiful Mirror Lake, just outside Lake Placid. But Greer has an ulterior motive—to gather information that could reopen the investigation into her husband's murder. Then an unreliable employee of the Whitaker family turns up dead in the lake and Greer begins an investigation—her second, after The Unkindness of Ravens—and finds that the suspect list is as long as the guest list, while the killer is still close at hand.