Katie Honors is known for being a remarkably nice kid who always tries to do the right thing. She works incredibly hard to be the perfect big sister, but her little brother Chuck makes it exceptionally difficult. Chuck is messy, sticky, and constantly ruining her carefully built creations. Katie secretly wishes she had a trampoline or a giraffe instead of a brother. Because she wants to stay perfect, Katie forcefully pushes all those angry feelings down deep inside. She calls this feeling the grumblesquinch. But holding in big, overwhelming emotions is exhausting, and eventually, Katie cannot contain them anymore. When she finally explodes, Katie discovers a vital and comforting lesson. You will find comfort in watching Katie learn that nobody is perfect, and there is always room to safely share even your most frustrating feelings with the people who love you.