"Mass Grave" is an adaptation of an obscure 1930s Boris Karloff picture. It's horror all the way, people. Beware. Very retro cool and lots of blood. I saw the flick, got inspired, inquired on rights, and took the reins. It's really only based on one big setpiece from the film, the best part of the film, but it was perfect for stage. All the dialog (except one key exchange) has been rewritten, with different characters, new names, and a new twist ending.