Thief 2: The Metal Age continues the story from Thief: The Dark Project. It was the last Dark Engine™ game completed.
The Unwelcome Guest
The Thief 2 demo was based on Life of the Party with numerous changes. Most of Angelwatch is inaccessible.
Was UG made before or after LotP? Seems to me the demo came first, and changes were made for the final release. (Closer ledges, removed the south approach to Angelwatch.)