Fifth grade is proving to be a challenge for ten-year-old Cassidy. There's a new girl at school who's stealing her best friend's heart, an abandoned bird who might not survive the winter, and an older sister whose emotional needs leave Cassidy scrambling to keep the peace. Cassidy will do anything to help prevent her sister's "Super Sophie Tantrums," even if that means pretending life is fine when it one-hundred-percent is not. But pretending has its limits and its costs, even for a sunshiny girl like Cassidy. Will she find a way to embrace the stormy side of her personality before everything falls apart?