Michael looks, with his father, for the truth about his paternal grandfather Henning Haslund, who was a spy, an arms smuggler and explorer at the turn of the last century, in the great international expedition to north-western China.
Michael and his father, the old Lord Chamberlain Søren Haslund-Christensen, are in the attic to find hidden treasures from the past. Grandfather Henning was famous explorer and heritage collector among Mongolian tribes and Michael has heard rumors that Henning lived a secret double life as a British agent and gunrunner. Now he wants to find out if it's true. He would also like to have time with his father, and time is scarce. He has lured his father on adventure - as they have been so many times earlier in their lives - on a journey in the grandfather's footsteps back in time to a story of love and despair and a magnificent spy plot that involves both grandfather Henning and mighty empires struggle for world domination.