Archibald 'Archie' Hope
A young artist engaged to Lucy who finances the mummy purchase and becomes the principal amateur investigator.
Lucy Kendal
Professor Braddock's stepdaughter and Archie's fiancée, whose loyalty is tested by the exposure of Braddock's crimes.
Professor Braddock
An obsessive archaeologist whose desire to possess the mummy and its emeralds makes him the organizer of the underlying conspiracy.
Sidney Bolton
Braddock's assistant, found strangled inside the packing case meant to contain the mummy.
Cockatoo
Braddock's devoted Kanaka servant and the direct perpetrator of both murders.
Mrs. Jasher
A financially desperate widow angling to marry Braddock, who knows more of the night's events than she admits, attempts blackmail, and leaves the confession that breaks the case.
Sir Frank Random
A baronet and army officer who loves Donna Inez and is framed when the mummy manuscript is planted in his room.
Don Pedro de Gayangos
A Peruvian nobleman seeking the mummy and emeralds stolen from his family.
Donna Inez de Gayangos
Don Pedro's daughter and Sir Frank's eventual wife.
Captain Hervey / Gustav Vasa
The American sea captain who stole the mummy decades earlier and later helps Braddock attempt an escape.
Widow Anne Bolton
Sidney's mother, whose memories and observations help connect present events to the older theft.
Inspector Date
The police officer who organizes the final attempt to intercept the fugitives at the river.