The story of two friends, teens in Brooklyn during World War II, flourishes in Chaim Potok and Aaron Posner’s adaptation of Potok’s beloved 1967 novel. In this moving tale of good people on opposite sides of an ideological battle, Reuven is the Orthodox son of a Zionist, Danny the son of a Hasidic rabbi bitterly opposed to a secular Jewish state. Honest performances by Jurgen Hooper and Nicholas Cimino enliven the tricky shifts in the boys’ relationship. As the Zionist moves from academic reserve to impassioned activism after the Holocaust, Craig Spidle grows in stature. And Jeff Still is mesmerizing as the complex, tormented Reb Saunders. Shade Murray’s direction is so sure-handed that no one needs to shout to be taken seriously. Through 7/9: Tue-Fri 8 PM, Sat 5 and 8 PM, Sun 2:30 and 6 PM, Writers’ Theatre, Books on Vernon, 664 Vernon, Glencoe, 847-242-6000, $40-$57.