There is a new relic called the Turning Mummy in Manchester Museum. It just arrived from the Valley of the Kings in Egypt and it is an unidentified king. When it has been on exhibition, it comes to life at night and walks out of the glass case it was exhibited in.
Ann and Lisa are trapped in the museum because Ann was too busy looking at the Egyptian relics, and Lisa got lost in the twist and turns of the corridors. When they finally stop daydreaming, the museum is closed. They see the new exhibit walking in the museum and overhear the mummy taking to the museum curator.