London, 2022. The heat is rising and things are reaching boiling point. As the world struggles to catch up to its new climate, nineteen-year-old Luke Spargo believes he's the only one who understands what's really happening to the sun - and if he's right, he's the only one who can stop it. But Luke's childhood demons are closing in. With the arrival of vibrant, turbulent Fee, the precarious balance of Luke's life shifts irrevocably; as the endless heatwave presses in and his secrets begin to spiral out of control, Luke must confront the terrible price of protecting them.