The book of Jonah tells the story of a prophet named Jonah who runs from God's command to go to Ninevah, a wicked city. After being thrown overboard and swallowed by a giant fish, Jonah repents and is delivered. In Ninevah, Jonah preaches a message of repentance, and the entire city turns to God. Jonah's story illustrates God's power, mercy, and compassion for all people, including those who might be considered enemies. The theme of obedience is also prominent as readers are encouraged to obey God's commands, no matter how difficult or seemingly foolish they may seem.