On July 19, 2002, Simon Cable (Ryan Phillippe), a young man, woke up from a coma. He was hospitalized the night before for stomach cramps, but found that he had no memory of what had happened in the past two years, and his memory was still in 2000. During this period, the beautiful and gentle Claire (Sarah Polley) and Anna (Piper Perabo), who claimed to be his wife but was very indifferent, came to visit Simon. The two women's words and deeds and descriptions of the past made him feel uneasy. Simon thought he was caught in a conspiracy, and it seemed that someone was harming him. He insisted on having a full body check. However, when he woke up again, he found himself back to July 3, 2000. This rather strange time and space jump also made Simon really recall everything that happened in the past two years...