Mitch Moore (Max Beesley) is a charismatic, emotionally immature late-night radio DJ in London who gives relationship advice to listeners while leading an unstable personal sex life. His best friend and radio producer, Woody (Joseph Millson), is engaged to Claire (Laura Fraser). Despite his friendship with Woody, Mitch engages in a secretive, passionate affair with Claire. When the betrayal is exposed, Woody breaks off the engagement and severs ties with Mitch, prompting a fallout that destabilizes Mitch's entire social circle.