Origins is the third act in the campaign of Monaco: What's Yours is Mine. It was released during the Architect's Patch. The beginning narrations are mostly told by the Lookout talking to Inspector Voltaire, who wanted information on the other crew members. The Lookout talks about how each of the crew members had been wronged in some way, and that were owed a "moral debt" as a result. According to the Lookout, laws do not apply to the thieves until that debt has been repaid.

Each level in the act focuses on the past of a specific thief. The act includes eight levels: