Adolescent Tom lost his parents and home in the Nazi bombing of Rotterdam. The orphan is taken in on uncle Tjerk's Friesian farm. Old farmhand Bauke gets him a (German!) shepherd puppy, even grumpy Tjerk can't resist their instant bond. As Tjerk feared, the boy takes grave risks wanting to revenge his parents on the German occupation garrison. Finding Dutch RAF gunner Haaksma starts a series of dangerous adventures.