Jenny Pepper never expected to end up like this. Tired of her job and her lacklustre marriage, increasingly marginal in her teenage daughter's life, Jenny stumbles into a vigilante rescue one night; suddenly her world is exciting again - and she's a hero. In secret - in costume - she walks the streets of her small town, seeking to right wrongs. But secret identities are tricky to maintain, and Jenny's need for adventure is beginning to cost her dearly. Then, amidst the petty crime, a terrifying villain appears.
It is 1977, the Queen's Silver Jubilee, and a photographer captures a moment forever: a street party with bunting and Union Jacks fluttering in the breeze. Right in the centre of the frame, a small Asian boy stares intently into the camera. The photograph becomes iconic, a symbol of everything that is great about Britain. But the harmonious image conceals a very different reality.