"Everything, Everything" is a young adult novel by Nicola Yoon that tells the story of Madeline Whittier, a teenager who has a rare illness that makes her allergic to the outside world. She lives in a controlled environment with her mother, Dr. Whittier, and has limited contact with others. When a new family moves in next door, Olly becomes her first friend and love interest. Their relationship challenges Madeline's sheltered life, leading her to question her health, her mother's decisions, and what it means to truly live. The story explores themes of love, freedom, and the desire for connection.