Nova: Mystery of a Masterpiece (9pm, UNC-TV) - Nova examines the work of art sleuths who tackle "cold case" art mysteries as well as the criminal market in stolen and fraudulent art. Includes a look at image analysis which reveals a portrait purchased for $20,000 to be a lost work of Leonardo da Vinci, which revalues the painting at $100 million.

Criminal Minds (9pm, CBS) - A serial rapist in Houston known as "The Piano Man" resurfaces and assaults his previous victims. Meanwhile, Prentiss deals with the trauma of rejoining the team.

Touch (9pm, Fox) - The debut of a new drama in which a blue-collar New York widower (Kiefer Sutherland) gets help from a social worker and an educator in an attempt to bond with his emotionally troubled son, whose obsession with numbers appears to enable him to predict the future. Adrienne has a review.

CSI (10pm, CBS) - Catherine (Marg Helgenberger, right) makes the painful decision to leave CSI. This is the final episode for Helgenberger, who has been on the show for 12 seasons. She hasn't ruled out returning for an occasional guest spot.

Royal Pains (10pm, USA) - Members of a rock band become ill, forcing Hank and Divya to figure out the cause, but the prescription debacle puts a strain on their working relationship.

Hot in Cleveland (10pm, TV Land) - Victoria's daughter arrives for a visit with the news that she and Melanie's son are engaged. Meanwhile, Joy's blind boyfriend thinks she's 26 and Elka prank-calls the New York Yankees third baseman.