December 2019 was a catastrophe for Labour. After nearly ten years in opposition, the party has suffered its fourth straight defeat and is approaching 15 years since it last won an election. As the soul searching begins, Labour’s broad church will have to ask: at what level do we disagree? Writing from a centre-left perspective, Chris Clarke points to where the guts of the dispute lie. He argues that disagreements come down to narrative, not core values. Belief or otherwise in the three central myths which drive left populism – a ‘dark knight’ conflict between good and evil, control by elite puppet masters and nostalgia for a golden age – represents the true dividing line between pro- and anti-Corbyn factions. Combative but constructive, this resource makes the case for pluralism and questions the premise of Corbynism.