England, 1939

Would you settle for a marriage of convenience even if your intended is your best friend?

Restless and independent, Lili Hamilton dreams of becoming a radical journalist. To avoid the scandal of her broken engagement to Scotsman Iain Brodie, her traditional parents send her to finishing school in Switzerland. On the way to her exile, she meets the dashing Leo Oppenheim, leader of the British Communist party, and a whole new world opens up for Lili.

As the rhetoric of Hitler booms across the Continent and World War II erupts, Lili flees to Leo in London, embracing communist ideals and free love. But causes need money to thrive, and Leo has set his sights on a daring raid of the biggest diamond center in war-torn Europe: Antwerp.

Lili infiltrates the Jewish community in Belgium and befriends both the Goldmunz family and Gestapo leader Ulrich Lemberg. Despite the horrors of war, despite witnessing the murder of a comrade, she becomes the diamond courier between Antwerp and London.

With terrible consequences...

The Diamond Courier is a young woman's fight to liberate herself from her privileged upbringing, for which she pays the highest price. Will love conquer over politics?