Red Right Hand by Duckyboos
Summary: “You’re one microscopic cog in his catastrophic plan, Designed and directed by his red right hand.”
It all starts with the mysterious note left on Dean’s chair. It all ends with Dean coming to terms not only with what he’s capable of, but how much that knowledge doesn’t bother him.
Comments: 9/10. I love this fic, it’s better than a ton of thrillers that I’ve read. Dean the librarian gets a note that leads him on a treasure hunt/cat and mouse change. He enlists the help of the Professor he meets at work that day, Castiel. Only, Castiel is not who he seems to be. Spoiler Alert: the mysterious note leaver is Castiel. They get together in the end, and become murder husbands. It’s pretty dark but not as dark as I thought it would be.