The Count of Monte Cristo by Alexandre Dumas.  
The Count of Monte Cristo, by Alexandre Dumas and Auguste Maquet, is a classic 1844 adventure novel about betrayal, revenge, and redemption, following Edmond Dantès, a sailor wrongfully imprisoned who escapes, finds treasure, and returns as the wealthy Count to exact vengeance on his enemies. Set in post-Napoleonic France, it's known for its intricate plot, large cast, and exploration of justice, mercy, and forgiveness, becoming one of Dumas's most popular works alongside The Three Musketeers. Maquet was a key collaborator, handling research and plot outlines, while Dumas added his signature flair.  
Key aspects of the novel:  
- Plot: Young sailor Edmond Dantès is framed and imprisoned. He escapes, discovers a hidden treasure on the island of Monte Cristo, and re-emerges as the mysterious Count to systematically punish those who wronged him.  
- Themes: Justice, revenge, mercy, forgiveness, betrayal, and the corrupting nature of power.  
- Setting: France, Italy, and Mediterranean islands during the historical period of 1815–1839, covering the Bourbon Restoration and the return of Napoleon.  
- Collaboration: While Dumas is the primary author, his long-time collaborator Auguste Maquet was crucial in researching historical details and developing the plot, making it a joint effort.  
- Legacy: A literary classic and one of the most famous adventure stories ever written, celebrated for its suspense, memorable characters, and exploration of the human condition.