You play Lafcadio Boone, who awakens in the titular casino mansion at noon. Throughout the day, several guests will be murdered. It’s your job to save them. Solving the murders is only the first step. By sneaking around, peeking through keyholes and observing CCTV, you get to see the murders play out. Then you must manipulate time – the day automatically resets at midnight – and seek a way to prevent the crime from happening.
For example, the very basic opening tutorial has you witnessing a shooting in a chapel. When the day resets, you put a blank bullet into the murder weapon, and when the killer attempts his crime, he is foiled.