Lilly's Purple Plastic Purse, written and illustrated by Kevin Henkes, is a children's book about a young mouse named Lilly who loves school, dressing up, and her baby brother. When Lilly brings her prized purple plastic purse to school, her teacher, Mr. Slinger, takes it away. Angry, Lilly retaliates by drawing a mean picture of him. However, Mr. Slinger returns Lilly's belongings with a kind note and snacks, prompting Lilly to realize she owes him an apology.