This incredibly clever noir-style detective game casts you in a familiar trope--a down-on-his-luck alcoholic investigator who has one last chance to keep his job.
The game is very detailed and clever, technically quite an achievement: NPCs can observe you and note your (openly carried) inventory.
You'll find the clues easily enough, but probably have no idea what to do with them. I recommend not spoiling this one, even if you feel stuck. Come back later and look at the game with fresh eyes, try crazy things, and really observe the characters. Save often & be prepared to restore old games.
This is a great game with a novel ending, and an original plot. It borrows heavily from tropes and concepts you'll be familiar with from other noir fiction, but still presents an entirely original and creative story.