Hour of the Olympics by Mary Pope Osborne

In ancient Greece, Jack and Annie discover that girls aren’t allowed to attend the Olympic Games. While Jack visits the stadium, Annie sneaks in disguised as a boy—and both find themselves caught in trouble. As they uncover the next piece of their quest, they learn about the values and limitations of Greek society. With spirited chariot races and daring escapes, the story brings classical history to life. It also raises questions about fairness, tradition, and change.