A collection of stories taking place from before the first book to just after [b:Changes|6585201|Changes (The Dresden Files, #12)|Jim Butcher|http://d.gr-assets.com/books/1304027244s/6585201.jpg|6778696]. I actually liked it better than [b:Ghost Story|8058301|Ghost Story (The Dresden Files, #13)|Jim Butcher|http://d.gr-assets.com/books/1329104700s/8058301.jpg|12731936]. No incoming apocalypse, a lot of actions, and the good guys actually get some breaks, unlike the books in the main storyline.
I am not going to discuss all the stories one by one, but will try to give the whole picture. What is good about them is that they fill some blanks in between the main story. Below are some minor spoilers. How did Harry meet Murphy first time? How badly is Michael crippled after evens of [b:Small Favor|927979|Small Favor (The Dresden Files, #10)|Jim Butcher|http://d.gr-assets.com/books/1298085176s/927979.jpg|2054834]? Where was Georgia during the events of [b:Ghost Story|8058301|Ghost Story (The Dresden Files, #13)|Jim Butcher|http://d.gr-assets.com/books/1329104700s/8058301.jpg|12731936]? These are answered in the book. Also, we get Thomas POV in one of the story, plus a couple of stories are very funny (and nobody tries to kill Dresden in them for a change). Good fast read.