This is book number 2 in the Blood Books series by Tanya Huff. Yes I read it in one day.
Clearly I'm enjoying this series, but there's only 5 of them and that makes me sad! But they're very re-readable so that's good.
The story in this one involves a family of werewolves and someone is hunting them. The family dynamic is very different than a human family (obviously!) but they're essentially a close-knit family that just wants to be safe. And ya know, turn into big dog/wolf/wer things.
The Henry/Vicki relationship moves quite a bit forward in this book. And the relationship Mike has with both of them changes. The scene when Mike is going to the farm to confront the two of them seriously had me laughing out loud at work.