Jack is a thirty-something advertising exec in New York City, living a life forged from routine. He is successful and stylish--and entirely bored until he meets Jill. In her twenties, fiery and adorable, Jill enters Jack's life like a hurricane. They meet and instantly connect, launching into a romance. Together they write a Manifesto of Rules to Live By, beginning with Rule 1: Be Honest. But after too many instances of Jill's disappearing, Jack forces Jill to reveal her secret.