Sundays At Tiffany's by James Patterson

An utterly charming, whimsical romance! Jane is a lonely little girl whose mother is the head of a Broadway theater company and has no time for her. While growing up, Jane has always had a handsome friend that only she can see...then suddenly when she is nine-years-old, he tells her he must go away. Now in her early thirties, Jane is as lonely as ever, when suddenly, she and Michael, her imaginary childhood friend become reunited.