The entire conceit of Just One Day revolves around whether or not you believe that Willem is the kind of guy that can change a girl's life. And I don't buy it. Allyson drove me nuts, too, although I recognize that the book turned into a personal journey for the poor girl to escape her pre-planned life and helicopter parents. 
 Maybe Just One Year will change my mind, because I like Gayle Forman enough to see where she's going with this.