When Hamlet says “For there is nothing either good or bad, but thinking makes it so” he is not pre-empting the modern shift towards moral relativism. Instead he is reflecting on the capacity for human thought to render moral judgement almost completely inert. He is begging for ignorance. Cursing his intellectual nature. Wishing for simplicity. This anguished reaction against an intellectual temperament is central to Claude Chabrol’s Just Before Nightfall, a film that strives to answer the question ‘When is a murder not a murder?’.