After decades of calm waters, diplomatic structures are collapsing and ego-fuelled world leaders are threatening us with nuclear war. But a group of physicists from the US and Russia won't let that happen. Guided by physics, they bring reason into spaces in which cataclysmic decisions could otherwise be made. Pavel is an authority on Russia's capabilities and Ukraine, David is an expert on North Korea and hypersonic missiles and Lisbeth is working on US nuclear safety. Archives in their attic reveal they are no strangers to speaking truth to power. Past success inspires optimism for their work in the present.