A great example of Cassie's bravery comes when she challenges Miss Crocker about the quality of the school books the class has been given. The books are almost ancient: dirty, tatty, and dog-eared, they're formally regarded as in "very poor" condition. Little Man is so angry at the state of the books that he throws his copy to the floor and starts stamping on it.
Miss Crocker is about to take the switch to Little Man when his sister Cassie bravely intervenes, pointing out that her brother can already read and that he's angry that the race of the student listed inside the book is now "nigra" instead of white. But Miss Crocker's not having any of this. She responds to Cassie by telling her that the books say "nigra" because that's what she and the rest of the class are. It's now Cassie's turn to be angry. She refuses to accept her book and is given a good switching by Miss Crocker for her troubles.