Smart, savvy advertising executive Murray Roberts is in control of his urban world. But a run-in with a would-be mugger and his gang in a large metropolitan park reveals the limits of his control. Cornered, Murray seeks refuge in a massive tree, leaving him stranded and surrounded by the young thugs and their leader Shark. Murray and Shark embark on a deadly war of wits that ultimately leaves the gang devastated and Murray confronted with the harsh reality of his own life.