In a world where hearts are physical objects that can be traded, stolen, or hidden, players take on the role of a heart-collector named Cass, who discovers a dark plot to harvest emotions from the citizens of Greythorn City. As Cass navigates through a series of morally ambiguous choices, engaging in conversations with quirky characters, deciphering their cryptic clues, and negotiating the ethics of heart ownership, players must unravel the mystery of who is behind the sinister operation. Each decision dramatically alters the storyline, leading to multiple endings based on how ethically or unethically players choose to handle the hearts of others.