There is a point early in this episode where it seems that it's going to be painfully predictable, but luckily it's not nearly as predictable as you might think. A girl is killed and crucified inside a Catholic church, of all places, and her twin sister is shot and killed in an otherwise apparently unrelated killing a couple of hours apart.
As far as the structure of the case, I think this is one of the more clever episodes I've seen recently. There are constantly more layers being revealed, and leads that seem promising but lead nowhere. The sisters don't know each other, the mother gave them up for adoption as babies, there are complicated love interests (one involving a priest), and a mysterious adopted sister who lived a lonely life and developed an obsession when she learned that she had a half sister.
One of the suspects is revealed to have a motive about some doctored award-winning photos of the troops in Iraq, which gives Grissom a great opportunity to make a more powerful political statement than I have come to expect from your typical CSI episode.
Even with a surplus of suspects it's hard to see where the story is going. Excellent performances throughout as well!
Oh and here's a great quote - " I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion." - Henry David Thoreau.
Me too, Henry. Me too...