This is the second book in the Owl Mage series, that began with Owlflight, so you should read that first.
I generally like Lackey's Valdemar books, and if you're new to them I'd start with the first published, Arrows of the Queen. They almost all deal with Heralds, a police/military force bonded to and partnered with "Companions," magical creatures in horse guise.
Heralds don't factor much in this particular trilogy though, but the Tayledras, featured in other stories, do, and for me that more than makes up for that. The previous book centered on Darian, a Valdemarian adopted into a Tayledras clan who wishes to be a bridge to both peoples. This book introduces Keisha Alder, a young healer-in-training from his village. I found her an appealing character and the book a light, enjoyable read, even if I wouldn't name it among Lackey's best.
