Nightdive Studios has announced The Tarnished Mirror, a new campaign for Thief: The Dark Project Remastered. The studio will share more information on November 2, ahead of the project’s winter 2026 release window.
The announcement arrived through a YouTube teaser, as first reported by Eurogamer. The footage uses artwork by Alexandru “Dominus” Negoita and includes the line, “Huh, not so secret anymore,” attributed to Garrett.
A leaked achievement list had already exposed the name
The Tarnished Mirror had surfaced before Nightdive’s teaser through Steam achievement data published by Exophase. The site listed information tied to unreleased games, including references to the add-on. Some of those entries were later removed, though archived copies remain accessible through the Wayback Machine.
That leak gave Thief fans an early indication that Nightdive’s project extended beyond a straightforward return for the original game. The studio has now made the plan official, placing fresh content alongside a title first released roughly 28 years ago.
The new material raises the stakes for the remaster
For players who have waited decades to revisit Garrett’s world, The Tarnished Mirror gives the release a larger purpose than updated access to the 1998 game alone. Nightdive previously developed a remake of System Shock, making this its latest effort built around a major older PC game.
Several important points remain unconfirmed. Nightdive has not given an exact launch date, detailed The Tarnished Mirror’s story, length, missions, or gameplay features, or said whether Stephen Russell recorded new dialogue for the teaser. Platforms, pricing, and how the add-on will be made available also remain unspecified; November 2 is the next date the studio has set for further information.
This article was produced with AI assistance from multi-source reporting and is published under our editorial standards.
