Chloe Abbington and her sister, Izzie, are enjoying huge success running Paint with a View, their paint party business in the tranquil western New York lakeside town of Whisper Cove. Now, their aunt Constance—president of the local chapter of the Chautauqua Sisterhood—has hooked them up with a gig hosting a Halloween painting party. The guests will be painting a local ghost legend, the Lady of Chautauqua Lake, who died a hundred years earlier and rises from the lake every October to haunt anyone who dares venture out on All Hallows’ Eve.

The event seems to be going off without a hitch, until Chloe overhears an argument between Constance and Viola Finnwinkle, the Sisterhood director, about the fate of the local chapter. Both women leave and the sisters finish their painting. But the next morning, Viola’s body is discovered floating face down near the town ferryboat dock. Eerily, the image is an exact replica of a painting Chloe and Izzie had discovered at the event the night before.

What’s more, the police find Constance’s purple knit hat lying on the ground near the crime scene. Constance pleads innocence, saying the hat mysteriously went missing during the event. Frantic that she might be charged with murder, she begs Chloe and Izzie to help her. The sisters believe their aunt is innocent, but if so, who’s the real killer—and when will the next victim turn up?