Twelve people have walked on the moon, but only one man — Philippe Petit (Joseph Gordon-Levitt) — has ever, or will ever, walk in the immense void between the World Trade Center towers. Guided by his real-life mentor, Papa Rudy (Ben Kingsley), and aided by an unlikely band of international recruits, Petit and his gang overcome long odds, betrayals, dissension and countless close calls to conceive and execute their mad plan.