Kruimeltje is delivered at Ms. Koster as a baby and does not know who or where his parents are. He sleeps on the streets as a stray kid more than at the Ms. Kosters. Nevertheless there is something to do every day in port, the store of Wilkes and at the Commissioner on his scepter. He arrests dangling villains, leads a rebellion against alcohol abuse, creates a crazy costume party at a concert and starts a flourishing trade in self-picked roses. Meanwhile, Kruimeltje also makes other people's lives a little easier. Everybody hopes he'll find his father and mother, but will this happen ...