Set in a world where the minor fae have 'come out' to humans, whilst the more powerful fae, and supernaturals such as werewolves and vampires keep themselves hidden from human eyes. Moon Called is an impressive start to a new werewolf / shapeshifter series. When a newbie werewolf arrives at Mercy Thompson's garage looking for work, it sets a chain of events in motion that will bring her past and present together, and have repercussions for all those around her.
Mercy makes an appealing heroine, not least because as a skinwalker she changes into a coyote (much weaker than a werewolf); meaning she has to rely more on her brains and cunning to get her out of trouble. And sometimes she just has to deal with the consequences of her actions.
This is a wonderful story, populated with well-drawn and interesting characters. One of the things that makes it so fascinating is the detail in the complex relationships between the members of the various werewolf packs and how Mercy fits into that equation.
The only problem I had, was that the vampire section seemed a little superfluous to the plot. (As the second book deals more with them, this was probably to serve as an introduction, but I thought it took the action away from the werewolves and wasn't strictly necessary.)
Although the werewolf hierarchy that Patricia Briggs writes about is familiar, she manages to make the world Mercy lives in, unique. Moon Called reaches a satisfying conclusion but we are left with enough dangling plot threads to make us look forward to the next book. If you like Kelley Armstrong and Kim Harrison, I think this is another series that you'll love.