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 the upstate New York village of Lake Placid. But Greer has an ulterior motive - to gather information that could reopen the investigation into her husband's murder. Her plans come to a halt when a wedding guest goes missing and turns up dead in the lake. Greer must rely on the wisdom of her favourite...