Hi guys. Was hoping that you all in your awesomeness could help me find a fic that's been driving me crazy for days.

It was a Criminal Minds crosover, where the team were profiling Sam and Dean, thinking they were killers. It was set towards the end of the year of Dean's deal,so there was real urgency in Sam and Dean's actions. I can't remember the name of it, but I'm pretty sure it was a one word title, and it began with 'D'. Defecit or somthing like that.

Hope someone can help!

E.T.A. Found by bard2003, celia_goes and obelix. It's Defect, by Kikkimax. Aaaand there is also a sequel, which I did not know about - Hell And Back