The Riders of the Whistling Skull

One of the most interesting of the Three Mesquiteer films has the guys getting involved in an archaeological expedition to find a hidden treasure guarded by a legendary Indian cult, presumably descendants of the Aztecs because they believe in human sacrifice. At least Robert Livingston almost ends up being barbecued at the stake.

Mary Russell's father and his partner went off in search of the cult and the partner came back, but he's murdered in one of those locked room puzzles. Despite or maybe because of the fact the Three Mesquiteers were in the room they go along to find a treasure and capture a killer.

These modern Aztec type cultists have kept up with modern weaponry because of their leader and when you find out who it is that will be self explanatory.

I'm agreeing that the film does resemble some of those cult Kharis mummy films some of which were not all that good. The end is a rather spectacular climax where the cultists are wiped out. Mother nature has more to do with it than the Mesquiteers.

Mesquiteer fans should enjoy this.