A lonely man in the midst of a divorce downloads an artificial intelligence to act as an operating system for his computer. He finds himself better able to connect to the voice of the system than he can to any human being, and begins to fall in love with it. Sci-fi drama, starring Joaquin Phoenix, Amy Adams and Rooney Mara, with the voice of Scarlett Johansson.

In the not so distant future, Theodore, a lonely writer, purchases a newly developed operating system designed to meet the user's every need. To Theodore's surprise, a romantic relationship develops between him and his operating system. This unconventional love story blends science fiction and romance in a sweet tale that explores the nature of love and the ways that technology isolates and connects us all.