The Oriental sleuth Charlie Chan(Warner Oland) rides a bumpy sea to attend a police testimonial in New York City. A wayward nightclub singer(Louise Henry)plans to collect a tidy sum of money by selling her diary that contains a wealth of information concerning previous criminal activities and naming names. When the chanteuse is murdered, Charlie and Number One Son Lee(Keye Luke)join Chief Inspector Nelson(Harold Huber)in piecing together clues to find the killer. An overzealous newspaper reporter (Donald Woods)and a spunky photojournalist (Joan Marsh) try to make the hunt easier...but do they? This film moves at a good pace and is typically true to the Charlie Chan formula. Other players: J. Edward Bromberg, Douglas Fowley and Joan Woodbury.