Original: As Lolita and Humbert drive westward again, Humbert gets the feeling that their car is being tailed and he becomes increasingly paranoid, suspecting that Lolita is conspiring with others in order to escape. She falls ill and must convalesce in a hospital; Humbert stays in a nearby motel, without Lolita for the first time in years.
Simplified: The main character, Humbert Humbert, falls in love, and has sexual relations with a 12-year-old girl nicknamed Lolita.