Perceptive Americana intertwined with story of young girl who slowly comes to realize her beloved Uncle Charley is really the Merry Widow murderer; Cronyn steals film as nosy pulp-story fan. Scripted by Thornton Wilder, Alma Reville, and Sally Benson from Gordon McDonnell's story. Remade in 1958 (as Step Down to Terror) and for TV in 1991.