On the same day she is diagnosed with a terminal brain tumor, she finds a book of ancient magical spells, one of which will allow her to switch bodies with an enemy. She jumps at the chance, swapping bodies with her ex-husband's new wife. She only intends to stay in her hijacked life for a few days, long enough to experience a perfect moment with her son, Tom. But she soon finds that a good life is not so easy to give up...