Newcomer Sierra/Affinity announced today that it will rep international sales at Cannes for the dark comedic thriller Filth, based on the bestselling Irvine Welsh novel. The adaptation was penned by Jon S. Baird; Ken Marshall is producing via Steel Mill Pictures (London to Brighton). In the book, an Edinburgh police detective manipulates those around him to secure a promotion and win back his wife and daughter, hitting on themes of abuse of power and all things sleazy.