What would you do if the sun became your enemy? That's exactly what happens to Viola Li after she returns from a trip abroad and develops a sudden and extreme case of photosensitivity—an inexplicable allergy to sunlight. Thanks to her crisis-manager parents, she doesn't just have to wear layers of clothes and a hat the size of a spaceship. She has to stay away from all hint of light. Say goodbye to windows and running outdoors. Even her phone becomes a threat when its screen burns her. Viola is determined to maintain a normal life, particularly after she meets Josh. He's a funny, talented Thor look-alike who carries his own mysterious grief. But the intensity of their romance makes her take more and more risks, and when a rebellion against her parents backfires dangerously, she must find her way to a life—and love—as deep and lovely as her dreams.