"Mary Anne's been going through some big changes lately. She has a new home and a new boyfriendless life. Her stepsister, Dawn, is coming to stay for the summer, which is always fun. But this time Dawn is bringing a guest: Sunny, her best friend from California. Sunny's been going through changes that are even bigger than Mary Anne's; her mom just died, and she isn't ready to face it yet. How can Mary Anne and Dawn help her?"