Detective Crabtree and Detective Murdoch investigate the mysterious and unexplained deaths of seven local Egyptologists. Julia discovers that the seven people died of spores.

Crabtree and Murdoch discover a hieroglyphic journal next to the Mummy's latest victim and use it to decode a secret message that reveals their very lives are in danger. The mummy is known only as Sekhmet also known as the Egyptian Goddess of Retribution. Queen Victoria is planning a secret visit.

Brackenreid arrives in the nick of time to save Crabtree and Murdoch from the clutches of the Mummy, which they discover is more human than they first thought. Unfortunately, the man is poisoned and they cannot question him. Dried mud on the dead mans boots come from Niagara Falls. The team sails the Clarissa to Niagara Falls but have to abandon the ship via lifeboat because they are attacked by Sekhmets henchmen.