In the end, Miss May said that she had met another mystery, but this time the mystery may never be solved, according to the picture, it should be that the mummy went back on its own, the owner still remembers that the door of the crypt was closed by a hand in the darkness, right? That should be the mummy's In fact, the last accurate statement is to leave a suspense
About the sequel, there must be no, the building owner is to think that it is not mummy, just take it as suspense. The only one with a sequel is probably Kissing the Count, but the others, like Donation at the Chateau and The Express, are probably just suspenseful endings
About the sequel, there is definitely no sequel.