Marie-Josée Saint-Antoine, a supermodel from Quebec living in New York City, was stabbed to death on June 18, 1982 in her Manhattan apartment. The New York City Police Department had little to no clues surrounding the case, but one suspect did stand out: Alain Montpetit, a major television star in Quebec. Forty years later, a team investigates the case in an attempt to understand what happened to Marie-Josée.