I don't really have to go into the plot particulars here because the film is pretty much a textbook example of what you need to have in a film of this specific horror sub-genre, so I won't. Instead I'll just give you the short list, so included among its many tropes are:
- A pack of British archaeologists who desecrate an ancient Egyptian tomb despite the warnings of an in-the-know local, only to face very dire consequences.
- Some form of "scroll of life" that handily re-animates the titular bogeyman.
- Some poor son of a bitch being driven insane by witnessing the mummy coming back to life. (The 1932 version of this trope is the best such ever to grace cinema and all we see of the mummy in that one is his hand and some trailing bandages. "Hee hee hee...He went for a little walk! You should have seen his face!")
- An ancient curse that proves all too real.
- The story's heroine bearing a marked resemblance to the mummy's ancient and forbidden love.
- A flashback to how the guy who became the mummy fucked up back in the days and ended up as a shambling mass of dangerous bandages.
- Loads of people meeting a gruesome demise at the hands of the mummy.
There were subsequent Hammer mummy films, but they kinda bite the big one in comparison to this and are best ignored. Rent this and you won't be disappointed, plus it's suitable for the whole family (provided the little ones can handle a genuinely scary mummy).