Law & Order rips another story from the headlines in the series' 13th-season opener. When a professor specializing in stem-cell research is murdered, the detectives at first suspect that the killer was a pro-life zealot. It soon develops that the actual target for extermination was the professor's wife (also murdered in the attack), who was raising money and public awareness for Muslim women's rights. Ultimately, the clues lead to a young Muslim extremist who calls himself Mousah Salim, but who is actually an American named Greg Landen (Wil Horneff). In prosecuting the case, the lawyers try to ferret out the motivation behind Landen's wild-eyed fanaticism, with surprising results. Fred Dalton Thompson joins the cast as new DA Arthur Branch. ~ Hal Erickson, Rovi