the Thief series is one of my most favorite, I love the game play and the story but it is really old like ancient...
There are 3 thief games that tell the story of an anti hero called Garrett the master thief and also anothe mod based on Doom 3 which is a standalone called The Dark Mod.
Thief 1: The dark project(1998)
Thief 2: The metal age(2000)
Thief 3: Deadly shadows(2004)
*The Dark Mod:
I DONT LIST Thief 4 as a continuation of the series because it stripped all the game mechanics of a real stealth game, the game is trying to appease new comers too much its like ass licking >.<
I wont spoil any of the story here because if I start I wont stop as you can see from this replay ...
Anyway even if you dont want to play the old game, you can still watch the story of the series on youtube and believe me it is a good story, pumping up before every mission.
and on top of it you can play The Dark Mod for free since it is a standalone to enjoy what the game was.