On the first day of kindergarten, can Ruthie find a new friend? Jessica has a friend only she can see: Jessica. There is no Jessica, said Ruthie's parents. But of course there was. She ate with Ruthie, played with Ruthie, and was sorry when Ruthie was bad. When it came time for Ruthie to go to school, Jessica went with her. Her parents hoped Ruthie would find a friend at school who would replace Jessica. They were in...