This game is based on the popular TV series that follows Dean and Sam Winchester in their hunt of supernatural beings. It is based on the same Cortex system that Serenity uses. The core rule book was release in 2008 containing all the basic information to play the game, and 'Supernatural Guide to the Hunted' was release in 2010 with expanded information on characters, monsters and items from the TV series, the third book 'Supernatural RPG: Road Atlas' is due to be released in 2011. Lot's of fun playing this system hunting ghost, demon, and other supernatural creatures in the modern day.
Basic rules and character sheets can be found here