When murder occurs among the "horsey set," ostensibly retired husband and wife sleuths Nick and Nora Charles (William Powell, Myrna Loy) spend a day at the races sifting through the usual long list of suspects-including a pair of high-stakes gamblers, two reporters, and a low-level tout-to track down the killer. Fourth "Thin Man" entry also stars Barry Nelson, Donna Reed, Sam Levene, Stella Adler. 97 min. Standard; Soundtrack: English DTS HD mono Master Audio; Subtitles: English (SDH).