1947. Elinor White, known locally as 'the White lady', is living a solitary, quiet life in a grace-and-favour cottage in the Kent countryside. Unbeknownst to her neighbours, she is the veteran of two world wars, a trained killer and former intelligence agent.

Yet Elinor's private and seemingly tranquil existence conceals a past trauma that comes to the fore when she is drawn into the predicament of a local man entangled with one of the most dangerous crime families in London. A treacherous path lies ahead, but it may be one that ultimately leads Elinor to a future unshackled from her own painful history.