A notorious sniper who has periodically terrorized Los Angeles for more than three decades is at it again, or so it seems. But this time there's a difference: communication, in the form of a rambling, manic letter. Matt and Emily think they can use the missive to smoke out the shooter. Plus there's another new wrinkle: a hostage. Donald: Raphael Sbarge. Bayless: Todd Tesen. Lucas: Timothy Carhart.