Set in the Los Angeles of the slight future, the story follows Theodore Twombly, a complex, soulful man who makes his living writing touching, personal letters for other people. Heartbroken after the end of a long relationship, he becomes intrigued with a new, advanced operating system, which promises to be an intuitive entity in its own right, individual to each user. Upon initiating it, he is delighted to meet "Dr. Steve Brule," a childlike, male voice, who is severely naive, socially awkward and largely ignorant. As his needs and desires grow, in tandem with Theodore's own, their friendship deepens into an eventual love for each other.
