A heat wave sweeps London, causing Bernard to obsess about beautiful girls and to seek a "Summer Girlfriend", Fran to suffer from insomnia, and Manny to panic about his 'Dave's Syndrome', a curious condition that purportedly triggers at 88°F (31°C). Naturally, Bernard refuses to believe a word of Manny's "attention seeking nonsense" and tries to get Manny as hot as possible. Fran discovers the walls of her flat are literally closing in as her unscrupulous landlord creates another flat from the stolen space. Bernard pretends to be her lawyer in an attempt to rectify the situation but quickly falls for the new lodger, Summer Girl Alice. At the end of this episode, Bernard asks Fran when they will admit they are deeply attracted to each other. Fran replies, 'only when one of us is dead', and Manny's condition triggers, with disastrous consequences. Guest starring Johnny Vegas as Fran's landlord and Rose Keegan as Alice.