Only the most desperate of thieves would consider breaking in to a building to steal vintage port on Christmas Eve, but that is exactly what the man, simply known as Thief, has just done. Hired to bring back the drink for a collector of fine wines and spirits, Thief finds himself searching the intricate passage and cellar system beneath the Mason's Building, an ancient building with a gruesome legend. Upon hearing the caretaker making his final rounds for the night, Thief hides in the darkness in an attempt to remain undetected, and does so with great success. Now, locked inside, Thief need only wait until morning to secure his release, sneak out undetected and return to the employer with his prize. However, even if the caretaker didn't know of his presence, something down there does... As the night draws on, strange and un-natural events occur, testing Thief's nerve and pushing his fear level to the limits. With nothing more than a dodgy torch, dying mobile, a lighter and a bouncy ball, Thief must decide to either keep hold of his imagination or call the police to bust him out. With so much money riding on the items he has just procured, can he really let a few bumps and bangs cost him his job, or will he ride it out and let the darkness cost him his sanity?