A young woman lost her memory after an accident. In the woman's bag is a note with Holger's address, does Holger know who she is?

Mortensen is inconsolable, but Esmé suspects that everything is not right. Together they travel on an adventure round Europe.

The search for Holger continues. Mortensen's hunt continues over the high peaks of the Alps and through verdant valleys. Esmé and Mortensen face unexpected challenges and find it difficult to get along.

Holger makes contact with his young relative Flora Graaf.

Mortensen has stolen Holger's identity for the geographer's great desert conference in Windhoek, Namibia.

Flora and Mortensen meet an American geographer who gives them a dangerous mission.

Mortensen and Flora make their way to the coast of Mozambique with the mission of finding the mysterious treasure.

Flora and Mortensen look for Geografi Graaf's assistant Ravi.

Flora and Mortensen are welcomed by Ravi. They hope to get answers to any questions they have about the mystery.

Flora and Mortensen head to Australia and the remote island of Tasmania's temperate forests and rivers in search of the secret cave.

Flora and Mortensen get a ride out to sea with a lobster fisherman off Tasmania.

The black sun follows Flora and Mortensen and it becomes a wild chase through the coniferous forest and into a wild rapids below the Rocky Mountains.

Our heroes get tied up and left in a barn.

Flora, Mortensen, and Esmé head south to find the Black Sun's headquarters.

Flora does everything she can to save her friends and defeat the powerful Brotherhood of the Black Sun.