Boris Karloff plays a crazy old guy who worships the Egyptian god, Anubis. On his death bed, he swears that if anyone should steal a sacred jewel from his Anubis statue he will return from the dead to exact revenge. Not surprisingly, several very greedy people come along and try stealing the jewel--only to incur the wrath of the zombie Karloff. Despite the whole Egyptian aspect of the film, though, he was not a mummy nor was this just a rehash of THE MUMMY (also from 1933). Overall, it's a rather standard but well-produced zombie murdering the idiots film--not great, but certainly worth seeing.
By the way, in a funny inside joke, there is a parody of the "desert savage" style of film. THE SHEIK, THE SON OF THE SKEIK and THE BARBARIAN were among several films like this and in THE GHOUL, there is a supposed sheik and a lady who is infatuated with this clichéd image of a macho and sexist Middle Eastern lover.