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.

A new riddle leads Esmé and Mortensen on. They are now certain that Holger has left the riddles behind but why?

Esme and Mortensen continue to the UK but feel empty and don't know where to look, but they meet a person who can help.

A terrible enemy chases Mortensen and Esmé, who flee for their lives to the south. When everything seems to be working out, the situation changes dramatically and nothing goes as planned.

Esmé need to quickly find out more information about herself, who is she? And time is short. The order of the Black Sun has everything they need to carry out their terrible plans to change Europe.

The friends must save Holger and the hourglass from The order of the Black Sun, but how?