Andrew Gage, created two years ago, is the public face of a multiple personality. There are hundreds of souls in his head. In the world outside, Andy works on ambitious, but unlikely, virtual reality projects. There, new programmer Penny Driver turns out to be a multiple personality, too, and the boss wants Andy to help her. Several of Penny's other souls ask for help, which Andy finally, reluctantly, agrees to give, thereby setting himself on a path that threatens the stability of his house.