Henryk is one of the young Jewish children that Barney is hiding from the Nazis. When Felix first wakes up in Barney’s secret cellar, he hears Henryk crying for his parents and Barney suggesting that Henryk may see his parents sometime in the future—a suggestion Felix scorns, thinking Henryk should be allowed to go find his parents right away. Felix’s reaction to Henryk shows Felix’s naivete about the situation in Nazi-occupied Poland. Later, Henryk reveals that Nazis killed and mutilated his dog, Sigi, exemplifying the horrible, pointless cruelty of antisemitic violence.