what is the conspiracy against Edmund Dantes in the count of monte cristo?

Edmond Dantes has just returned from a journey aboard the Pharaon. Things are looking pretty good for him. Edmond has been promoted to captain and he plans to marry his sweetheart Mercades. Dantes will not get the chance to realize his bright future, however. His success has earned him three conspiring enemies. They write a letter falsely incriminating him in a Bonapartist plot (the royalists are currently in power). These three enemies are Danglars, Fernand Mondego, and Caderousse. Danglars will become captain of the Pharaon once Dantes is removed, Fernand aspires to win Mercedes' love, and Caderousse is a jealous neighbor of Dantes.

Perhaps the conspiracy would not have been so successful had not the denunciation fallen into the hands of the public prosecutor, Monsieur de Villefort. This man has nothing personal against Dantes, however, he has Dantes incarcerated as a most dangerous criminal. His policy against Bonapartists must be extremely vigilant in order to counter the reputation of his father. His father is a known Bonapartist, and Villefort is paranoid that this fact shall hurt his career among the ruling royalists. Thus, he throws Dantes, an innocent man, into the Chateau D'If.

Much of this is an excerpt right from GradeSaver. Just follow the source link below.