The Victorians loved faeries. Even the creator of Sherlock Holmes, Sir Arthur Conan Doyle loved them a believed they were real. This book help you do that for your game as well.
Plenty of faerie races are given along with their d20 stats for playing them as characters. These will work well in any d20 game regardless of the time period.
A new mechanic is introduced, Traits, but familiar if anyone has played Unisystem or GURPS. In fact it is because of this that makes this book more easily ported over to games like Ghosts of Albion or Victoriana.
Traits and Drawbacks can be bought to customize characters.
Rules for Fey-Touched characters are also given.
There are some monsters stated, mostly these are fey creature that would not work well as characters. Plenty of new feats and an advanced classes.
Advice is given on the Faerie lands and how to run games that involve the fey.
This might be my favorite of the Imperial Age books just in terms of material to be used. The organization of the material is kind of all over the place and the art is not quite a good as the other books, but that didn't matter to me since I was most interested in the words on the page.