Anna has two favorite things: her best friend, Sadie, and her dog, Banana. She can't wait to celebrate her birthday with both of them.But Anna's birthday party turns into a birthday disaster when Sadie starts a terrible fight that Anna never saw coming. Anna doesn't know why her best friend is suddenly acting like her worst enemy, but she knows she'd do anything to fix it. She and Banana just need to come up with a plan.Only, what if Sadie doesn't want their friendship to be fixed?