Greed and Criminal Motivation

The theft of the valuable Medusa Medallions and the subsequent murder are driven by greed, with characters like Foss and the gang members willing to commit crimes for financial gain.

Cecil criticizes Maurice's 'infernal miserliness and greed for cash' in selling their father's collection, hinting at financial motives.

The motive for the fake burglary is to prevent the sale of the medallions to Mr. Kessock.

Armadale's theory hinges on Polegate's knowledge of the medallions' value and his planning to steal them.

The connection between the theft of the Medusa Medallions and Foss's murder suggests greed as a motive.