A meaningless little spat is keeping Spirou and Fantasio apart that day, when the young bellboy sees his friend in the company of a mysterious neighbor.
Shortly afterward, a jewelry shop is robbed, and the owner identifies Fantasio, who has come to cover the event for his newspaper, as his aggressor.
When the very next day a priceless Egyptian mask is stolen live on TV by .
Fantasio, Spirou is left with little choice but to investigate….