When a lovestruck banker is rather gullibly conned out of a priceless string of pearls and then dies in a mysterious road accident, his partner "Stanley" (Addison Richards) comes to our renowned sleuth to ask him to investigate. He's reluctant but agrees and that's when he meets the interfering daughter "Delia" (Joan Perry) who rather spoiled this mystery for me. Anyway, Warren Williams ("Lanyard") reckons he knows how to track down the stones and hopefully thereafter get to the bottom of the death, so with the help of stalwart "Jamison" (Eric Blore) sets about solving the crime. The first twe...