London, 2005. Yvonne Hartman is the undisputed head of Torchwood One. Above the government, beyond the police, she has excellent people skills; enjoys regular tea with the Queen; and effortlessly defends the British Empire from alien threats.

Yvonne Hartman is excellent at her job, and inspires devotion in everyone who works with her - until, one day, she makes a terrible mistake. We all make mistakes. But only at Torchwood can a single mistake plunge your world into interstellar war.

Yvonne Hartman's facing the fight of her life. One she's going to win.