Finding a young boy called Steve wandering the streets, the Wildes take it upon themselves to look after him until the authorities can find his family. However, various other people would dearly love to look after him and are willing to go to great inconvenience to do so.

The Wildes go to Amsterdam. Detective fiction writer Rupert is looking for a plot, but finds instead a beautiful girl hiding in his hotel room. It's fun time for Rupert -- until someone hits him on the head...