Simon is a shy guy, unsure of himself and unable to express their opinions or ideas. E despised mother, always humiliated by his boss, ignored his dream woman, Hannah. It feels unable to change these things.
One day, while going to work, his place in the subway occupied by a stranger who looks identical to him, and you get to work just discovered that this unknown, James, is his new colleague, who usurps the position in the company.
Now neurotic, Simon has to do with this liner, which has qualities that he lacked: safe, charming, successful and superficial. To his horror, that James begins to take control of life, replacing it.