Air Date: Wednesday 12/7

Us Rating: **1/2

Another CSI sea change! In the start of a three-parter, ace crime-solver Catherine Willows (Marg Helgenberger) clicks with a handsome fed (Grant Show) as they investigate a shady military firm. While the case is routine, diehard fans will enjoy a deeper mystery: Might Willows quit CSI for the guy? (It's likely, as Helgenberger soon departs after 11 years on the show.) Sentiment aside, this aging hit could use a quicker pulse. (CBS, 10 p.m.)