Meet Carl and Hamilton and marvel at their collections of classic cars, Viking treasure, Celtic gold and Nazi memorabilia, establishing them as obsessive collectors of rare and extremely valuable items. The duo invites historian and best-selling author of ‘The Templars: The Rise and the Spectacular Fall of God’s Holy Warriors’, Dan Jones, into their inner sanctum to reveal the hoard to an outsider for the first time. Excited but cautious, Dan challenges Carl and Hamilton to prove each items provenance before they release news of their discovery to the world. This will involve tracing the relics back to their country of origin, unpacking the history of each item and figuring out how they were used. Most important of all, they want to work out whether the existence of the relics sheds new light on our understanding of the mysterious Knights Templar.