Cappie and Sam discover the run-down tree hut. They meet Laurens and find a very strange device and six playing cards. A painting is stolen.

Cappie and Sam form a club, together with Siggy. They call it The Caps Club. Siggy discovers that the strange device is a Braille machine. Seven museum treasures go missing without a trace.

Ruben and Charlotte join The Caps Club. Together they find the meaning of the six playing cards. Laurens has disappeared from his house in the woods. All of the films from the cinemas go missing.

Museums, zoos, and cinemas have all had to close their doors. TV stations go off the air. The Caps Club find letters in Braille and the logo with the black eye.

The Caps Club discover who is behind the TV stations going off the air, but he is kidnapped soon after they meet up with him.

The electricity goes off everywhere. The Caps Club discover that Jonathan is being held in the mansion. Cappie goes there on his own and is also taken prisoner.

Together with the children of Hughevliet school, The Caps Club manage to force their way into the Mansion. They finally discover who is behind everything and why.