When a horse breeder is apparently kicked to death by his horse aboard the ship Charlie Chan (Warner Oland) is taking from Honolulu to Los Angeles, the famous sleuth is on the case. He soon concludes the death was not an accident. Chan's investigation uncovers a gambling ring that may have been involved in the death. H. Bruce Humberstone directs this classic mystery caper, which co-stars Keye Luke as Chan's Number One Son, Lee.