Taken from mobygames.com:

When the game starts you start wandering around the house examining all rooms and their objects. You also need to question all guests trying to figure out how to solve this crime puzzle. You must find the murder weapon and get all the guests together at the exact murder scene. Next step is to confront the murder. But beware: you need to solve this murder puzzle within a certain time because otherwise the murderer will get annoyed of your gumshoe actions and eventually sneak up upon you and eliminate you.

http://www.mobygames.com/game/dos/sleuth