Impostor Factory is the third game in Freebird Games' loosely-linked RPG adventure series To The Moon. It follows the eponymous game and its sequel Finding Paradise. Freebird is calling this one Episode X - that's the letter X rather than the Roman numeral. It'll link in with the other To The Moon games in a subtle way.
You play Quincy, a man who's invited to a party at a mysterious mansion. When you arrive, you find that the mansion has a time machine. Before long, things start going wrong and people start dying. It's up to you to discover the source of the murders and save the day.