Malcolm is a character in Fable III. He is the eponymous brother in the quest Rescue the Miner's Brother, which is only available if the Hero chose to accept Reaver's proposal to turn Bower Lake into the Millfields Mines.
The brother of a miner named Bill, Malcolm was unfortunately left behind in the mines when they became overrun with hobbes. Unable to reach an exit, the miner fled to one of the upper levels.
Should the quest be taken and completed, Malcolm is returned to Bill safely by the Hero. However, the duo admit that they should get back to work in the mines.