1970, Boston, and a daring attack on an armoured transport delivering money to a bank, catches Massachusetts law enforcement napping. While the police are still trying to figure out where this new and coldly efficient gang sprang from, more dazzling heists follow - each one meticulously planned and ruthlessly executed. It soon becomes clear these are no ordinary criminals, but as one of the cops assigned to the case figures, 'longhairs that got bored with protesting the war and branched out.' Faced with a tight-knit cell of urban revolutionaries led by a charismatic intellectual with no compunction about killing for the cause, the authorities seem powerless to stop them. Unless they step outside the law themselves...