In a lonely cottage overlooking the windswept Maine coast, Wilder Harlow begins the last book he will ever write. It is the story of his childhood summer companions and the killer that stalked the small New England town. Of the body they found, and the horror of that discovery echoing down the decades. And of Sky, Wilder’s one-time best friend, who stole his unfinished memoir and turned it into a lurid bestselling novel, Looking Glass Sound.

But as Wilder writes, the lines between memory and fiction blur. He fears he’s losing his grip on reality when he finds notes hidden around the cottage written in Sky’s signature green ink.