The Chameleon and the Mysterious Pup

Hielke and Sietse are working on their boat, the Kameleon, when their father's lunch suddenly disappears. The chicken legs are nowhere to be found. The boys soon find the thief in the shed: a puppy. But there is something strange about the pup. To be sure, they have the dog checked by the vet. There it soon becomes apparent that Hielke and Sietse have not just found any dog... Their search for the mother leads to Huizinga's farm. Suspicious things are happening around that farm... What is Huizinga up to?