Enigma del ataúd, El was released in the year 1969。Enigma del ataúd, El is also called as The Orgies of Dr. Orloff, Sólo un ataúd, Orgies du docteur Orloff, Only a Coffin。

A doctor invites his relatives to his castle, all the while planning to murder them when they arrive. However, when he himself is found murdered, the relatives know they have to find the killer before he gets them all.