Layer Cake (2004)

A 29 year-old British drug dealer, whose name is never revealed, runs a legitimate real estate office as a front, but plans to retire before he turns 30. When he is lured back into one last deal, he gets involved in an international drug ring that forces him to adapt die-hard rules to save his life and to reach the top of the layer cake.

Official website: http://www.layercake.co.uk