American Prisoner

The American Prisoner is a downloadable content mission set to appear in Assassin's Creed: Unity.

Official synopsis
''After being involved in the American Revolution, Thomas Paine lived in France for most of the 1790s, becoming deeply involved in the French Revolution. Regarded by some as an enemy of the nation, he was arrested and imprisoned in a Parisian "Hotel Particulier". Infiltrate his prison, find Paine and collect all of his manuscripts before they are stolen by his enemies.''

Reference

 * Assasin's Creed official website