Harry Dresden, the only professional sorcerer in Chicago, is close to the darkest point in his life... For as the Winter Knight of the Queen of Air and Darkness, Harry never knows what Mab's intrigues may turn out for him. Usually it's trouble. He doesn't even know the half of it... Mab simply traded Harry's skills to pay off one of her debts. And now he is forced to help a group of supernatural villains, led by one of Harry's worst and most despicable enemies - Nicodemus Archleone, break into the most guarded place in the city in order to gain access to the most guarded place in the Nevernever. This is a raid to return the Holy Grail itself from the vaults of the greatest storehouse of valuables in the supernatural world, belonging to Hades himself - the ruler of the fucking Underworld and a generally unpleasant person. Even worse, Dresden suspects that there is another game going on at the same time that no one is mentioning. And he is also sure to death that Nicodemus does not intend to let a single witness from his team leave alive. Especially Harry. Dresden has always been able to get out, but he will have to play a game of treachery to survive this chaos - unless his own allies kill him before his enemies do...