Perhaps you’ve read the classic story of The Count of Monte Cristo by Alexander Dumas, or hopefully you've had a chance to see one of the film versions made over the last fifty years or so.
Very briefly, it's a powerful story that unfolds in an early 19th century coastal city in France, where love takes its three central characters on a long journey of revelation, and the eventual realization of what matters most in their lives.
The hero, Edmond Dantes, is accused of a murder that he didn't commit, by Fernand, a lifelong friend, who is the one who actually committed the crime. Fernand is so jealous that Edmond has the love of Mercedes, the heroine, that he ensures Edmond is thrown into a hellacious, inescapable prison, and left there to die. But when, after many torturous years in captivity, Edmond manages to escape by a series of almost impossible coincidences, he plots an elaborate scheme of revenge against those who betrayed him.
As the story nears its climactic end, Mercedes, whom Edmond never stopped loving – and who never stopped loving him – sees through his elaborate charade (as the Count of Monte Christo), and learns of his plan to take revenge on Fernand.