In this one, Harry is warned by the gatekeeper that there is black magic in Harry's neighbourhood... or their will be very soon. Messing around with time is forbidden, but that never really bothered the gatekeeper, so Harry takes the warning seriously.
The war with the vampires is getting serious now with no quarter asked or given. The white council, of which Harry is now a member, gives their newest warden (Harry) a job to do. He must find out why the summer and winter courts are not helping the council against the vampires. They need the help badly. The problem is, every time Harry gets involved with the never never and its politics, he ends up over his head and in debt to someone too powerful to live with. Literally!
He asks help from his friends the summer knight and summer lady, but they are under a geas not to help directly. So who walks into the bar and into their meeting? The winter lady!! None other than the wife of the winter knight, the man Harry destroyed in recent times and the opposite to his friend the summer knight. Things go from bad to worse when his best friend's daughter is kidnapped and taken to the winter court, leaving Harry no choice but to mount a rescue. Things come to a climax in the Winter Queen's stronghold, where he slaps Queen Mab in the face (not literally thank god) by unleashing summer magic at the very heart of her domain. To top it all, the girl he is looking to save might be the very black magic user he is oath bound to kill!!
A must read for all Dresden fans.