In a not so distant future our communicative devices take over a lot of our social work. But some things can only be done by humans. It's Theodore Twombly's Job to write letters for other people. Just divorced from his wife Catherine he turns towards the new advantages of technology. In this case it is the new operating system that comes with artificial intelligence and a wonderful smooth voice. His OS starts by naming itself Samantha and turns out to be great company in all everyday situations. Theodore attempts to find a new love but he soon discovers that it is Samantha who makes him happy — and he is not the only one.