The Witness

The Witness was the seventh game released by interactive fiction pioneers Infocom.
The player character is a detective who has been summoned to the Cabeza Plana, California office of Mr. Linder, a millionaire. Linder fears that his life is in danger… and indeed, as he sits in his office with the player, he is murdered before the player’s eyes. The player then must solve the murder.

Storyline

FEBRUARY 1938, LOS ANGELES FDR's New Deal is finally rolling. Hitler's rolling, too; this time through Austria. But as Chief Detective for a quiet burgh on the outskirts of L.A., you've got other fish to fry. One gilt-edged society dame is dead. And now it looks like some two-bit grifter is putting the screws to her multi-millionaire old man. Then, unexpected, on this stormy February night, a wealthy but frightened man has asked you for protection. In spite of your best efforts, a death will occur, and you will have twelve hours to solve the mystery and try to arrest the killer - the shakedown turns ugly. You're left with a stiff and a race against the clock to nail your suspect... unless you get nailed first! Nobody said a sordid family affair like this was going to be a cinch. Everyone from the knockout heiress to the poker-faced butler may end up in the slammer before it's over. Ahead of you is a Gordian knot of motives and alibis. And the only testimony you can trust is that of your own eyes--because you are The WITNESS.