Adapted from the Fannie Hurst story of the same name, Mannequin is the story of Joan Herrick (Dolores Costello), kidnapped in infancy from her wealthy parents (Alice Joyce, Warner Baxter) and raised by a slatternly slum woman (ZaSu Pitts). Growing up a real "looker," Selene manages to finds work as a model in an exclusive Manhattan dress shop. She falls in love with crusading newspaperman Martin Innesbrook (Walter Pigeon), who is presently campaigning to prevent beautiful murderesses from escaping the full weight of the law on the basis of their good looks. In due course, Joan is herself accused of murder, causing Martin to regret his "sexless justice" campaign. In a hardly flattering comment on the American legal system, Joan is acquitted when the judge on the case turns out to be her own father.
by Hal Erickson synopsis