The Count of Monte Cristo by Alexandre Dumas

Edmond Dantès, a worthy and loving sailor, is imprisoned on the night of his wedding feast for a crime he has not committed. Thrown into solitary confinement, he decides to starve himself to death. But a few weeks later, there’s a scratching on his wall. Curious about the sound, he begins to eat again, using the serving dish to dig up. He eventually comes across a fellow prisoner, Faria, an Italian priest, who bequeaths him a secret treasure hidden on the island of Monte Cristo.