Tells the story of an alcoholic, Milland, on a weekend bender. While on his bender he stops in at his favorite watering stop - Nat's Bar on Third Avenue, based on the legendary P. J. Clarke's. There he seeks companionship in his drinking with congenial bartender Nat (Howard da Silva). As the weekend continues, Milland drifts deeper and deeper into his living nightmare, committing crimes and even spending time in a mental ward. Unlike the novel, the protagonist's frustration in the film stems not from homosexuality but from his frustrations as a would-be writer.