Bassie en Adriaan: De Geheimzinnige Opdracht.

An unknown man asks Bassie and Adriaan to track down packages throughout Europe. To find the packages they have to solve all kinds of strange riddles. On their quest for the packages they travel through the whole of Europe and discover beautiful and interesting places. What they don't know is that De Baron, Handige Harry and B100 are trying to lure them into an ambush. Thus begins an exciting but beautiful adventure!