Bobby Phillips wakes up one morning, and after taking a shower he notices in the mirror that he can't see himself. He goes to tell his parents and once they realize he is not joking around, they make a rule not to tell anyone about this, then they go off to work. After a while, Bobby decides to go the library all bundled up so people think he is visible.
When he was leaving the library, Bobby accidentally bumps into this girl named Alicia Van Dorn, and his scarf falls off and reveals his invisible face. The girl doesn't flip out, because it turns out she is blind. Once he gets home, Bobby gets mad at his dad because he left a single note behind him when he left. So to make Bobby feel better, he goes to pick up his mom, but gets in an accident on the way back.
While Bobby was home by himself for a couple weeks, he becomes friends with Alicia. They were once fighting, and to make her calm down, he told her that he was invisible. They eventually tell Alicia's parents, the parents are calm about the situation, and Bobby work things out, Bobby then finds out that people think he is missing, and gets worried.
Bobby and Alicia have a feeling that his electric blanket could've caused him to be invisible. Since it was from Sears, they broke into the records and call nearly every number from people who also bought the blanket. They find out this also happened to another person named Sheila.
Alicia tells Bobby to trace his steps from the night he turned invisible. He gets woken up by the noise of people talking, and gets out of bed. He ran and hid in the corner by himself, naked. When the social worker and police officers walk in, they look right at him. He then looks down, and can see his own self standing right there.
Once Alicia finds out he isn't invisible anymore, she writes him a poem saying how she feels he won't need her anymore. Bobby reads it, and he decides to go to her house, and tell her he loves her.