Supernatural (2005)

S10E21 Dark Dynasty

Dean and Sam delve into an unusual murder case, uncovering that the perpetrator shares a tattoo linked to the notorious Styne family. Simultaneously, Castiel steps in as a mediator when Charlie and Rowena are compelled to collaborate on the enigmatic Book of the Damned. Meanwhile, Crowley, realizing his mother has vanished, seeks assistance from a former adversary.