Whenever you hear the sky rumble, that usually means a storm. In Virgil Flowers' case, make that two. The first storm comes from, of all places, the Minnesota zoo. Two large, and very rare, Amur tigers have vanished from their cage, and authorities are worried sick that they've been stolen for their body parts. Traditional Chinese medicine prizes those parts for home remedies, and people will do extreme things to get what they need. Some of them are a great deal more extreme than others - as Virgil is about to find out. Then there's the homefront. Virgil's relationship with his girlfriend Frankie has been getting kind of serious, but when Frankie's sister moves in for the summer, the situation gets a lot more complicated. Forget a storm - this one's a tornado.