According to some rumors that are chasing on Overkill, developer of Payday: The Heist, would be working to achieve under the supervision of a prequel to the series Left 4 Dead . The study, recently acquired by Starbreeze (Syndicate), would complete the survival horror game saga with a title that would send events back in time until the emergence and spread of the virus. Will keep you informed as soon as a few new details emerge.