A teenager's life is changed when she encounters a humpback whale swimming up the Thames.
Tanya and Lena spend their nights binge drinking and getting into trouble. One night at a party their lives take different paths. Lena is asked to join a local gang but Tanya is overlooked. Feeling dejected, Tanya wanders home and spots a whale swimming up the Thames. The whale becomes stranded for days and Tanya gets involved with helping it get back out to sea. At the same time Lena is getting deeper into gang culture. Tanya wants to save the whale but she might have to save her friend first.