"What is locked...
can be opened...
What is hidden...
can be found...
What is yours...
...can be mine."
— Garrett
Thief is set in a dark fantasy world inspired by Victorian, gothic, and steampunk aesthetics. Garrett, a master thief who has been away from his hometown for a long time, returns to it, a place known only as The City, and finds it ruled over by a tyrant called The Baron.
Begins when Garrett is paired with his former apprentice, Erin, who both ended up accepting the same job from Basso, a man who has many connections within The City's underworld and is one of Garrett's only friends.
With players having a number of possible paths and approaches in a given level. Players may use the environment to their advantage, as well as pickpocket characters. As Garrett attempts to steal in levels, guards and other non-player characters will try to flush him out and kill him.