Edmond Dantès, a young and successful merchant sailor recently granted his own command, returns to Marseille to marry his fiancée Mercédès. Leclère, a supporter of the exiled Napoléon I, charges Dantès on his deathbed to deliver two objects: a package to Maréchal Bertrand (who had been exiled with Napoleon Bonaparte to the isle of Elba), and a letter from Elba to an unknown man in Paris. Subsequently, an anonymous letter accuses Dantès of being a Bonapartist traitor. The letter is later revealed to have been written by Mercédès' cousin Fernand Mondego and Danglars, Dantès' ship's supercargo. Villefort, the deputy crown prosecutor in Marseille, assumes the duty of investigating the matter. Villefort is normally considered a just man, but on discovering that the recipient of the letter from Elba is his Bonapartist father, he ultimately chooses to save his political career and condemns Dantès without trial to life imprisonment and protects his father by destroying the incriminating letter.
After fourteen years imprisonment in the Château d'If, Edmond is visited in his cell by the Abbé Faria, a priest and fellow prisoner trying to tunnel his way to freedom. Faria provides Dantès with a comprehensive education in subjects including languages, history, economics, philosophy, mathematics, and the manners of polite society. The priest, ill from a form of catalepsy and knowing that he will soon die, confides in Dantès the location of a treasure hoard on the Italian islet of Monte Cristo. After Faria's death the following year, Dantès escapes and is rescued by a smuggling ship. After several months of working with the smugglers, he gets the opportunity to go to Monte Cristo for a goods exchange. Dantès fakes an injury and convinces the smugglers to temporarily leave him on Monte Cristo. He then makes his way to the hiding place of the treasure. He returns to Marseilles, where he learns that his father has died in poverty. He buys himself a yacht and hides the rest of the treasure on board. With his newfound wealth and education, Dantès buys the island of Monte Cristo and the title of Count from the Tuscan Government.
Returning to Marseille, Dantès puts into action his plans for revenge. Traveling in disguise as the Abbé Busoni, Edmund first meets Caderousse, whose intervention might have saved Dantès from imprisonment. Now living in poverty, Caderousse believes his current state is punishment by God for his jealousy and cowardice. Dantés learns from Caderousse how his other enemies have all become wealthy and prosperous since Dantès' betrayal. Edmund gives Caderousse a diamond that can be either a chance to redeem himself, or a trap that will lead to his ruin. Caderousse murders the jeweler to whom he sold the diamond, and he is sentenced to life in the prison galleys. Dantès (using another disguise, this time as the English Lord Wilmore) frees him and gives him another chance at redemption. He does not take it, and becomes a career criminal.
Learning that his old employer Morrel is on the verge of bankruptcy and disgrace after his ships have been lost at sea, Dantès (in the guise of a senior clerk of the banking firm of Thompson and French of Rome) buys all of Morrel's outstanding debts and gives Morrel an extension of three months to fulfill his obligations. At the end of the three months and with no way to repay his debts, Morrel is about to commit suicide when he learns that all of his debts have been mysteriously paid and that one of his ships has returned with a full cargo (the ship had been secretly rebuilt and laden by Dantès).
(from Wikipédia)
