Jack and Jill vs. the World

Jack is a 30-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 20s, 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.