The book is a set of four short stories which run about 60 pages each. Each story is set in a series. Jim Butcher's is in The Dresden Files, Simon R. Green's takes place in The Nightside, Kat Richardson's takes place in her Greywalker series and Thomas E. Sniegoski's is in his A Kiss Before the Apocalypse universe.
As usual, I enjoyed Jim Butcher's story. It takes place about a year after Small Favor and answers the question of what happened to one of Harry's friends. I can't say more without spoiling the end of Small Favor. Anyway, it was a good story. I'm sure that means Turn Coatwill pick up a year or so after the short story. Butcher does like to skip years between novels but at least his contributions to anthologies give us a sense of what happened in the interim.
Simon R. Green's story was fine. It was a typical Nightside story.
I liked Kat Richardson's story as well. There wasn't much development of Harper's abilities or her relationships with people in her hometown, but it was still a good story and Quinn made a very brief appearance, as did Chaos, and that's always fun.
I'm not a big fan of Thomas E. Sniegoski:. I didn't love A Kiss Before the Apocalypse and had the same reaction to this story. It's not bad, it just doesn't appeal to me.