In tonight’s salute to Agatha Christie, TCM saves the best for last, so set your recorders. At 3:30 a.m. ET, the network presents 1957’s Witness for the Prosecution, a wickedly clever murder mystery and courtroom drama directed by Billy Wilder. The stars in this one include Charles Laughton and Marlene Dietrich, both of whom deliver fabulous performances. Also featured: Tyrone Power, and one of Christie's, and the cinema’s, classic twist endings.