A whistle pierces through the monotonous buzz of a working class neighborhood in New York City.
The aerial view wanders through the buildings until we close in on the Jets, a bunch of white gangbangers with names like Ice, A-rab, Baby John, and Action. They're running the basketball yard snapping their fingers. (There's a lot of finger-snapping in this flick. Lots of Daddy-o, too. It's the '50s.)
The Jets survey their territory where local kids try to enjoy their summer day in the sun.
When they bump into the members of another gang, the Puerto Rican Sharks, a game of one-upsmanship quickly ensues.
The tension escalates until the action comes to a head and the cops show up to break up the fun.