Timely Demise

A theoretical adventure game for the Game Mockup Jam.

Your sister is a well known private investigator on the verge of closing a big case, and she's invited the relevant figures to a gathering to finally resolve it. Of course, she turns up dead in the middle of it, stabbed once through the heart in her office. It's up to you to find her killer, and close the case for good.  However, be careful about how you spend your time and who you share your information with. Your actions will influence the sequence of events, and more bodies may start turning up, including yours. Please, enjoy the tension of this ever-tightening closed circle to your heart's content.

The concept was "game that sounds cool to play but would be a nightmare to fully implement with any substantial granularity", plus "murder-mystery where the protagonist doesn't have plot armor". Plotting a linear mystery game is already hard enough, but doesn't having to investigate cleverly to beat the culprit sound like it would be fun?

No derivative works please!