Jeremy, a high school English teacher coming to grips with a shattered marriage and haunted by the brother he lost, unexpectedly falls in love with his best friend, Zak. Attractive, wildly unconventional, and happy in an open relationship with his partner Annie, Zak seems to embody everything missing from Jeremy's life, but when the arrest and death of a marginalized student at the Brooklyn high school where they both teach trigger Zak's mental breakdown and slow descent, Jeremy and Annie are compelled to cross boundaries, both external and internal, in a desperate attempt to save him.