After being murdered by a mystery assailant, navigating his way through the realm between life and death, and being brought back to the mortal world, Harry realizes that maybe death wasn’t all that bad. Because he is no longer Harry Dresden, Chicago’s only professional wizard.

He is now Harry Dresden, Winter Knight to Mab, the Queen of Air and Darkness. After Harry had no choice but to swear his fealty, Mab wasn’t about to let something as petty as death steal away the prize she had sought for so long. And now, her word is his command, no matter what she wants him to do, no matter where she wants him to go, and no matter who she wants him to kill.

..he's still bound by the deal with the winter queen after however he ressurects in cold days. I mean I'd ssumed he was going to get out of it simply by 'the deal was I was knight until i died. I died, we're even'

So did Harry. The slight problem being that he didn't actually die, Mab was able to keep him alive when she realised what was happening and wasn't going to let him get out of his deal by something as easily preventable as death.

Half of the point of Ghost Story is just how colossal a fuckup what Harry did in Changes was, and how the fallout is affecting people he cared about.

What Harry did in Changes was kind of iffy. I mean I get that a lot of shit came out (massive supervillain free for all, widespread chaos, Molly's damaged sanity) but at the same time the power of a faction that is more evil than the Hitler Stalin, Mao and many other monsters from history combined has been broken after millennia. What if he had failed? What if the Red court won? What world would they have ushered in if they won the war (a likely outcome if the ritual had succeeded with it's intended target)?
I also get the fact that most of the bad crap could have been avoided (Arianna gunned for Ebeneezer and thus Maggie because Harry had refused to cooperate with ortega, or that they could have left if Harry had seen through Big Red's ploy) but at the same time) but it's also important to realize that the only way to make ammends is to make sure you don't make the same mistake twice.
Loved Cat sith and the ticking croc.

I doubt anyone but Mab, Cat Sith, Leah and the nurse, from winter at least, even know Harry is the new Knight/alive. Bob or Toot might know, and everyone else went from having hope to being sure he was dead as of Ghost Story. I want to see how they react to finding out hes alive and nastier than before. That and I want to know how Dresden reacts. Does he get a new car/office/apartment and try to go back to old Dresden or does he set up shop in the Kinghts Chambers and work from there. Will he get a new coat or did that die with Susan. Does Mouse come back or does he live with Maggie now? Because Changes indicated there was a point to him actually being with Dresden, so where does that leave him? Does Marcone shit at the idea of having to fight Dresden for magical control of Chicago again?I want those questions answered dammit, not an admittedly kind of funny scene where Mab proves to still be scary as hell or a cat bitches at people.

I think that's why you have to take Changes in with the books following it. Changes was very up front about the fact that Harry was quite literally going "The world can burn. That's my daughter." Ghost Story and Cold Days are basically him seeing the consequences of him saying the world can burn. He saw what happens to everyone else in Ghost Story(Molly's sanity, Murphy's alliance with Marcone, etc). Cold Days he sees what really happens to him. It's like a one-two gutshot of maybe some things aren't worth everything.

I though a big part of the reason Outsiders were so hard to fight is because magic doesn't want to stick to them, but now we have them being fought almost entirely by a magical army, and Dresden can hammer them like any other reasonably tough monster. Which is annoying. That said, Winter and Summer as a whole make a lot more sense now, Winter will sacrifice anything because it is fighting a war it absolutely cannot loose, and Summer can afford top be a lot nicer because it has almost none of the same issues. I also like the way the Mantle of the Winter Knight seems to be designed to make one mortal very powerful, provided they are smart, strong willed and fundamentally decent, the instant they take it for granted or forget it it makes them very vulnerable to attack from anyone halfway smart (all of the Fae queens, and a lot of their more powerful advisers)

We have pretty good evidence for Lash still living in Harrys head. Demonreach either has a good sense of humour or that's likely to be bad for Harry long term, the White Council now seems more useless than it ever has, very few members actually know half of what is happening, outside the SC I'd put good money on none of them having it. Lara Raith has probably been hit by Nemesis given what Thomas said about her seizing a lot more power more openly than the courts usually do.

I'm kind of sad Maeve kicked it, she was nuts as hell but kind of fun, and I like the way it was sort of implied that the other mythologies are tied in a lot closer with the Fae than was implied before. Odin and Kringle appear to be connected, I won;t be surprised if the most powerful name that Mother Winter and mother Summer have been known by is one the White God or Gaia or any other creator has been known by.

A friend of mine suggested he's needed to go after Outsider summoners, but if that's all it was Mab could just as easily tip off the Gatekeeper and/or the Wardens.