Accomplished chef, Gemma, and her paramedic boyfriend, Kieran, live together in West London, above Gemma’s café. Kieran and Gemma are madly in love, but love alone can’t pay café suppliers, or London rent. The pair are barely making ends meet. To ease some financial pressure, they decide to take in a lodger. Ray, a former world-class synchronised swimmer, changes the couple's lives - and how they view relationships - forever.