: Their relationship is put to the ultimate test when a mistake leads to Katie being exposed to sunlight, causing her health to rapidly decline. Origins and Adaptations

Midnight Sun by Trish Cook is a contemporary young adult novel about , a 17-year-old girl with a life-threatening sensitivity to sunlight called Xeroderma Pigmentosum (XP) . Because of her condition, she lives a nocturnal life, spending her days indoors and her nights playing guitar at a local train station. Story Summary

: Katie struggles with whether to tell Charlie about her condition, choosing instead to hide it so she can experience a "normal" summer romance.