In Lena’s world, love has been declared a dangerous disease. Her people believe it’s the root of all evil, the cause of all violence and wars. Everyone who turns eighteen is matched with a suitable wife/husband, but undergoes a surgical cure so that they are fully immunised against the dangerous effects of love. Lena’s own mother was a victim of the terrible plague, and she’s waited all her life to finally be immunised, to finally be safe. But when she meets Alex, a boy from a completely different world, everything she thought she knew and believed changes around her.