Skin Game

Wizard Harry Dresden is stranded on Demonreach with a parasite burrowing into his mind, cut off from his allies and running out of options -- until Mab, the Winter Queen he serves, offers a cure for one dangerous favor. Harry must team up with Nicodemus Archleone, a centuries-old enemy who has nearly killed him before, to break into a vault guarded by the Greek god of the underworld. As the crew comes together -- a warlock, a professional thief, a shapeshifter, and Harry's ally Karrin Murphy -- the heist's true target turns out to be something Harry never expected: the Holy Grail. The fifteenth novel in Jim Butcher's Dresden Files.