Charlie must sort out the stories of the archaeological team, deal with the crazed son of the missing scientist, learn why priceless treasures are falling into the hands of private collectors, and battle many seemingly supernatural events.

Carol's brother Barry has been rendered lame by an accident at the site, and is prone to playing sad songs on his violin.

They X-Ray it and discover a 20th-Century bullet lodged in the "Mummy", which turns out to be Professor Arnold's corpse; drained of blood and mummified to remove giveaway decay.

Chan discounts the supernatural, as the murders have been committed by someone with sharp knowledge of modern science.He discovers that Barry had been killed when a high note from his violin shattered a glass vial filled with poison gas.

Exploring the tomb at night with an eager Tom Evans, they discover a secret room that can be reached only while swimming underwater.

This is the cue for the murderer to try to finish the job---but Chan and a small brigade of Egyptian police are waiting and take the killer into custody.