Another all-original story tale of the Dresden Files! Months after the events depicted in Jim Butcher's New York Times bestselling White Night, the War between the Red Court and White Council rages on. But vampires are far from the only supernatural threat Chicago's only wizard for hire must stand against. Someone has unleashed an entity unlike any Harry has yet encountered - and it has begun targeting the innocent, seemingly indiscriminately. Along with his apprentice, Molly Carpenter, Harry must uncover the truth behind this new predator... no matter how far into darkness he must descend.

Something large, ruthless and possessed of supernatural power is smashing its way through Chicago-not to mention some of its residents. Harry and Molly are desperate to end its trail of destruction, but first they need to figure out what the blasted thing is. Further complicating matters is the involvement of "Gentleman" Johnny Marcone, the city's most powerful mob boss and recent signatory of the Unseelie Accords. Marcone's determined to find the creature, too-and if he has to go through Harry, so be it.

With the help of Bob and a rather twisted spirit entity, Harry has tracked a killer to Chicago's deadliest supernatural neighborhood: the labyrinthine network of subterranean tunnels known as Undertown! It's a place even powerful mages fear to tread, but Harry has little choice if he wants to prevent any further bloodshed. At least he'll have Molly with him...if, of course, she survives her own encounter with their enemy's remains.

Harry, Molly and Mouse have embarked on a journey into the darkest recesses of the supernatural: the subterranean realm known as Undertown. At the end of their path lies the evil power behind the creature that's murdered two innocent people. Finding and defeating that being will be hard enough-and it'll be even harder with an uninvited ally along for the ride...

Harry and company - along with an unwelcome ally - have tracked the Golem through the dank labyrinth of Undertown, and now find themselves in the very heart of madness and evil! Now, they must face the unstoppable creature... but even if they can defeat it, can they defeat its dark master?

Chaos has been unleashed deep beneath the streets of Chicago - and now it threatens to erupt into the world above! Harry's formed a tentative alliance with longtime nemesis "Gentleman" Johnny Marcone, but even their combined strength may not be enough to stop the Golem and its malign creator. That is, not without one of them being willing to make the ultimate sacrifice...

Chicago wizard-for-hire Harry Dresden and his new apprentice, Molly Carpenter, intend to end the havoc caused by a mad sorcerer - one whose ambitions would have the Windy City streets carved out as his own private kingdom. But when the magical upstart enters into an alliance with the notorious mob boss "Gentleman Johnnie" Marcone, will the fast-and-loose Dresden and his young charge survive unscathed?