From Wikipedia
5 Days a Stranger chronicles the story of a gentleman thief known as Trilby and four others fighting an unknown terror in DeFoe Manor. The story progresses over 5 days, with more story being revealed each day. Dream sequences typically space out the transitions between the events of different days, it has an intuitive version of the AGS interface that ties in with the unique feel of the game. The game has been translated into German, Finnish, Hungarian, Turkish, Italian, and Russian.
The game was created in 2003 with the Adventure Game Studio (AGS) engine and won awards for best game created with the AGS engine in 2003, best gameplay, best dialog scripting, best puzzles, and best scripting. The game has also had many good reviews on adventure game sites