Fascinating Rhythm is set in December of 1924. A senior editor at Healcroft House Frank Selby turns up dead in his apartment. Problem is, his secretary, Kathy Briscow, never mentioned that he hadn't been at work for the previous three days. Seems he only came in when he wanted, and since Kathy was doing his work for him, it didn't matter. But now, Kathy is the main suspect in his murder. Author and socialite Freddie Little finds out that Kathy has been editing his novel, and not Selby. Freddie also has reason to suspect someone else. So he convinces Kathy to work with him to find the real killer. Together, the two comb the streets and speakeasies of New York City to find a killer with obsession on the brain.