Gossip Girl: : At the reading of Bart's will, Lily, Chuck and Bart's brother, Jack (Kelly Rutherford, Ed Westwick, Desmond Harrington), learn the fate of the Bass empire. (8 p.m., WNUV-Channel 54)


24:: Jack (Kiefer Sutherland) and Renee track Dubaku, with Chloe's help. (9 p.m., WBFF-Channel 45)

Hard Time: : This new six-part series takes an inside look at Georgia's prison system, where military-style discipline is the order of business. (9 p.m., NGC)


Medium: : Allison (Patricia Arquette) wakes up in the middle of the night beneath a freeway overpass with no recollection of how she got there, but has a feeling she may have killed a man with her car. (10 p.m., WBAL-Channel 11)


Dirty Harry: : Don Siegel directed Clint Eastwood when he first played the maverick San Francisco detective in this 1971 thriller about his search for a psychotic serial killer (Andy Robinson). Reni Santoni, Harry Guardino and John Vernon also appear. (8 p.m. and 10:15 p.m., AMC)

Late-night guests

The Tonight Show with Jay Leno:: Actor Mickey Rourke; actress Toni Collette; John Legend performs. (11:35 p.m., WBAL-Channel 11)

Late Show with David Letterman: : Actress Kate Winslet; sportscaster Marv Albert. (11:35 p.m., WJZ-Channel 13)