The Twelve gathers twelve short prophetic books onto a single scroll, spanning roughly three centuries of history from Hosea and Amos' warnings to the northern kingdom in the 8th century BCE to Malachi's address to a struggling post-exilic Jerusalem in the 5th, joined not by continuous narrative but by shared length and, largely, shared theological concerns about covenant faithfulness and coming judgment or restoration. Their individual character varies widely: Amos indicts economic injustice with blunt, memorable imagery, "you who trample the needy," Hosea frames Israel's covenant unfaithfulness through his own troubled marriage to an unfaithful wife as a lived symbol, Jonah stands apart from every other prophetic book as a short, ironic narrative about a reluctant prophet who flees his mission, is swallowed by a great fish, and resents God's mercy toward the foreign city of Nineveh he was sent to warn, and Habakkuk opens not with an oracle but with the prophet directly arguing with God over the problem of injustice going unpunished.
Micah supplies one of the Hebrew Bible's most quoted single verses summarizing what God requires, "to do justice, and to love kindness, and to walk humbly with your God," while Malachi, closing both the collection and the entire Hebrew Bible's prophetic era, ends looking forward to the return of Elijah before "the great and terrible day of the Lord."