Death of a Salesman by Arthur Miller

From chapters.ca:
Willy Loman, the protagonist of "Death of a Salesman," has spent his life following the American way, living out his belief in salesmanship as a way to reinvent himself. But somehow the riches and respect he covets have eluded him. At age 63, he searches for the moment his life took a wrong turn, the moment of betrayal that undermined his relationship with his wife and destroyed his relationship with Biff, the son in whom he invested his faith. Willy lives in a fragile world of elaborate excuses and daydreams, conflating past and present in a desperate attempt to make sense of himself and of a world that once promised so much.