This movie is the fictional story of computer programming genius Milo Hoffman after graduating from Stanford and getting out into the competitive world of computer software. In his contemplation of where to begin his career, he is contacted by Gary Winston whose character is loosely based on Bill Gates. Winston is the CEO of a company called NURV, and they are on the brink of completing the global communication's system, Synapse. They need Hoffman to help them meet their launch date, so after much thought and with the full support of his girlfriend Alice, he accepts the job. Tragedy soon after strikes and Milo becomes suspicious of the company he has been wrapped up in. He learns that trusting anyone could be a mistake, and that nothing is as it seems.

Arriving at work one morning, Helen discovers that she had been unjustifiably sacked from her PR job. She is returning home when an amazing thing happens, time reverses itself for a few seconds and a second version of herself is created. In one reality Helen catches the tube train, meets James and arrives home to find her loathsome Lothario lover Gerry cheating on her with his ex-girlfriend Lydia. In the other reality, Helen misses the tube train, gets mugged, goes to hospital and eventually arrives home to find Gerry alone in the shower. The two realities move forward in tandem; in one Helen leaves Gerry and forms a happy, new, loving relationship with James; in the other Helen's live becomes more and more wretched as she takes on two jobs to support her worthless, cheating boyfriend as he supposedly writes his novel but in fact carries on a torrid affair with Lydia.