Retired police detective, Dan Novice, and his wife, Karen, a retired social worker, arrive in France for a three-month vacation. The trip commences with a visit to Honoré and Michelle, their old friends, to celebrate Michelle's father's eighty-fifth birthday. A wealthy and eccentric businessman, Oliver Bres has planned a murder mystery weekend at his country winery, where he announces that a large cash prize will go to the person who solves the mystery. Fierce rains move in, destroying communications, challenging the weekend's plans, and closing the only road to the mountaintop estate.

Honoré, a police chief, is forced into action when one of the guests dies. Were they murdered? Dan assists in processing and securing the scene while waiting for the authorities to arrive. More guests are murdered, and red herrings occur. Each person seems to have a secret. Dan and Karen realize they might be in danger without any escape. Are their old friends involved? Their host? Working together, can they survive and identify the killer . . . or killers?