Boston Blackie's (Chester Morris) wealthy friend, Arthur Manleder (Lloyd Corrigan), purchases an upscale bookstore from aged Wilfred Kittredge (George M. Carleton), but retains his services as a book expert. However, when Kittredge becomes ill just before an important auction he was to conduct, Blackie proves that he can impersonate him, fooling everyone, including Police Inspector Farraday (Richard Lane (actor)).