After Professor Marsh disappears whilst searching for the lost city of Lukachukai, a party of anthropologists including Marsh's daughter Betty arrive in a Western town to prepare an expedition to look for him. Meanwhile, the Three Mesquiteers have discovered a delirious man wandering the desert and bring him to town where Betty recognises him as a member of her missing father's expedition. As the man slowly gets his memory back the party wishes to know the location of Professor Marsh and Lukachukai that contains an ancient legendary treasure. The man is murdered with a knife bearing an Indian description. The Mesquiteers recognise that the murderer is one of the party in the room. Keen on his detective magazine that he constantly carries with him, Stony and the Mesquiteers lead an expedition to find Professor Marsh, the lost city and its treasure and the murderer. Well armed devil worshiping Indians and walking mummies enliven the proceedings.
366 Weird Movies says
Riders of the Whistling Skull is the kind of movie which is so delightfully in love with its period that one could easily imagine a true genre geek like Tarantino falling in love with it today. Director Mack V. Wright is completely comfortable throwing horror, western, jungle, mystery and comic relief into a seamless mix.