Nancy (
Loretta Young) and Jeff Troy (
Brian Aherne) move into a somber-looking basement apartment building on 13 Gay Street, Greenwich Village, where the residents all act very strangely. Nancy recognizes one of the residents, Anne Carstairs (
Jeff Donnell), who acts very oddly and not at all the way Nancy remembers her. While eating in a nearby restaurant named Polly's Stable, Nancy overhears a man, later identified as Louis Kaufman, talking on the telephone telling someone to meet him in the basement apartment. Louis goes to the basement apartment and is later found dead in the backyard. from evidence it seems he had been drowned in the apartment's bathtub. Jeff recognizes the basement apartment as a former speakeasy and reunites with the mascot of the old bar, a box turtle called "Old Hickory". The turtle's peregrinations in the building cause a series of scares and frights. Jeff and Nancy figure out that all the residents were being blackmailed by a man named Andrew Bruhl, who used to be a private investigator. Bruhl made all the blackmail victims live in the building at 13 Gay Street to keep an eye on them. Jeff and Nancy figure out that Bruhl killed Kaufman, and that Bruhl is someone who lives in the building. The suspects are Anne Carstairs (
Jeff Donnell); her husband, Scott Carstairs (
William Wright); Eddie Turner, the landlord; Polly Franklin (
Lee Patrick), who owns Polly's Stable; Lingle (
Richard Gaines), another resident; and the housekeeper, Mrs. Salter (
Blanche Yurka). ==Cast==