Wiske has a birthday and receives an old engraving of a pirate ship from Lambik. Professor Barabas arranges for the children to take a look at this pirate ship. There they find the diary of the pirate captain Blackbeard. When we got home again, our friends started reading it. To their dismay, Blackbeard imprisons the rainbow princess on an island because she did not want to marry the pirate. This island can only be found by following a rainbow to where it touches the horizon.

Part one of five