Former Broadway dancer and current agoraphobic Billy Shine has not set foot outside his apartment in almost a decade. He has glimpsed his neighbors—beautiful manicurist Rayleen, lonely old Ms. Hinman, bigoted and angry Mr. Lafferty, kind-hearted Felipe, and 9-year-old Grace and her former addict mother Eileen.

But most of them have never seen Billy. Not until Grace begins to sit outside on the building’s front stoop for hours every day, inches from Billy’s patio. Troubled by this change in the natural order, Billy makes it far enough out onto his porch to ask Grace why she doesn’t sit inside where it’s safe. Her answer: “If I sit inside, then nobody will know I’m in trouble. And then nobody will help me.”

Her answer changes everything.