The first colony on Earth’s moon has just had its first murder. I’ve been tasked with catching the killer.

My name is Coba. I’m a robot with artificial general intelligence, meaning I can learn any intellectual task a human being can.

A colonist is found with his neck snapped and his heart cut out. The heart is missing. A suspect is in custody, but something doesn’t add up.

Strange events start to unfold, including a rash of bizarre sleepwalking incidents. The colonists’ conflicting accounts of the murder make me wonder if everyone is lying to me.

I realize the killer wants to play a game with me when a gift box shows up in my room. Inside is the victim’s missing heart.