How is Eugenie and Andrea's wedding upset?

There is a betrothal party at the Danglars' house. Monte Cristo arrives and attracts much attention. Madame de Villefort is present yet Monsieur de Villefort is not. Monte Cristo explains that it is his fault that the public prosecutor is absent. He explains that a vest was found which belonged to the murderer of the thief who broke into his residence. The vest also contained a revealing letter. He mentions that the thief Œs name was Caderousse. At the mention of this name, Danglars pales. Calvacanti also disappears, just in time, for police come for his arrest. They announce that Calvacanti is an escaped convict.