Willem is a moody and mumbling conqueror, but with the boy Paul, he joins friendship and tells him all his adventures ... Woeste Willem is a retired earner who is the only one in his self-built hut. One night there is a boy on his roof that does not dare anymore. After Willem helped him, he always finds little presents on his sidewalk. They become friends and build a ship together. But then Willem must confess that he can not actually swim. Fortunately, Frank has a swimming pool for him. The happy smooth text together with the prints is an excellent whole. Beautifully executed picture book for children from around 4 years.