Karin Slaughter has two book series, the Grant County series and the Will Trent series.The two come together in UNDONE.

Jeffery Tolliver was murdered in the Grant County series. Now, three years later, his widow, Sarah Linton, has moved to Atlanta and is a doctor at Grady Hospital. Will Trent and his partner, Faith Mitchell, are there to investigate the case of one of Sarah's patients, a severely battered woman. She had been hit by a car after escaping her kidnapper who had repeatedly raped and tortured her. The story is about their investigation.

But the story is about more than that. Typical of Slaughter's books, characters are as important as plot. Sarah is still upset about Jeffery's death and blames his coworker. Will stays calm and collected and still can't find it in himself to get rid of his mostly absent wife. And Faith worries about losing her job when she becomes pregnant and develops type II diabetes. Sarah wants to be useful to the investigation, which, at first, aggravates Faith.

The investigation soon becomes convoluted when more women who have been kidnapped, raped, and tortured are discovered. These three main characters' lives are always part of the story. This book is both plot driven and character driven, the kind of novel that will grab and retain your attention.

Better yet, UNDONE, as with Slaughter's other books in her series, could stand alone. That is, even though it continues the stories in the series, you can enjoy it by itself. For example, because I buy Slaughter's books as they become available at used book sales, I read them out of order. Ideally, I'd read them as she writes them, but this works, too.