So, in Lazarus Rising, Castiel pulls Dean out of Hell four months after his death. In Mystery Spot, Sam catches up to the Trickster six months after Dean's semi-permanent-death. 

I'm looking for a fic more or less combining two episodes, with Cas rescuing Dean from Hell while Sam is still hunting for the Trickster; they'd then have to deal with a semi-dark!Sam (as seen in Mystery Spot) and the general aftermath of that episode. while simultaneously trying to do something about the Apocalypse.