Pride by Rachel Vincent, number three in the series.
This book see's Faythe on trial for apparently infecting her "human" boyfriend and therefore turning him into a werecat, then killing him to cover up her crime. There are three things you never do in the werecat world, one, Infect another human, two,Murder and finally three, Disclose the werecat secret to anyone. Since Faythe has broken these rules if found guilty there will be an extremely serious punishment.
Again in this book plenty of mystery, a little romance and pack loyalty. This book is a real page turner.
Available Amazon.com, Amazon.co.uk £3.99 Play.com £3.99 and Bookdepository.co.uk £3.98