I characterized The Clockwork Dagger as a Steampunk romance. The sequel The Clockwork Crown is substantially more than that. This short story provides some insight as to Miss Percival's actions in the noted stories above.
The Waster war is not explained in this short story. This story merely provides background on the other books. I think that it might fare better as a preface in one of the books rather than a stand alone story. There wasn't enough background here on the Lady or the Tree or the abilities of Miss Leander or Miss Percival.
I liked the story but I don't think it would be as enjoyable without having read the books.
This book may have been received free of charge from a publisher or a publicist. That will NEVER have a bearing on my recommendations.