Claire, a university lecturer and mother of two teenage boys, is contending with the approach of middle age and remains stung by the betrayal of her ex-husband, who is building a new life with another partner. Claire has a new lover too, the handsome Ludo, but is under no illusions as to his fidelity. Out of a mix of petulance and curiosity, she impulsively creates a fake Facebook profile in which to keep an eye on him: she's 'Clara', vivacious, blonde... and 24 years old. Ludo doesn't take the bait, but his close friend Alex does, and their online connection soon becomes flirtatious. Titillated by the opportunity to be "young again", Claire's deceptions lead both of her identities into increasingly dangerous territory...