Leaving is the story of Ahmad and Donna, and their unlikely and doomed friendship that develops and then disintegrates. Ahmad arrives in the United Kingdom a lonely man searching for a new home and a new life, he encounters Donna, a disconnected teenager searching for something beyond her routine existence. Their lives are intertwined against a modern backdrop of social dysfunction, fear and ultimately terror that strikes the heart of London. A dramatic turn of events befall the pair, altering their lives forever.