Once again, Simon R. Green has written the literary equivalent of jumping iover the moon to avoid the shark.
This time, Eddie Drood and Molly Metcalf have to solve who killed off all of the Department of the Uncanny (including his grandfather, the Regent of Shadows) and find the mysterious Lazarus stone that's currently Property of a Lady Faire. (Yeah, not sure what Bond title that's a play on.)
The Lady Faire in question is more or less Dr. Frankenstein's version of an incubus/succubus; s/he is a combination of genders and more or less exists as the ultimate honey trap. Seems that Eddie's Uncle, the Grey Fox, gave the Lady the Lazarus stone, which the person who killed everyone at the Uncanny wants back.
So, Eddie, (who was given another chance at becoming the Drood Patriarch if he gave up Molly) goes on a quest to find the Lady Faire, who's hosting a party for all her lovers past in Ultima Thule. Mind you, it takes 3/4 of the book to get there, including a detour in a place off of the Nightside to meet the Doormouse.
Like almost all of the books in Green's shared world, this is a quick read with lightning pacing. His cast of characters remain almost comical in their exaggeration, and his mythology is vastly entertaining.