Imagine what it will be like being the last man standing on The Demeter.
You’ve searched the ship; you don’t have a stowaway. Therefore the only rational explanation, awful as it is, is that one of your fellow crewmates is responsible.
But what happens when there’s only two of you left, and you know you’re not the murderer, so it must be the other person, and you’re waiting to see if they’ll make a move on you too
and then they disappear.
And then you’re alone.
Except. Maybe you’re not.