A fun premise executed well. Some twits and turns and I like the ways it plays into and subverts the mystery locked room genre. Certainly takes an opportunity to say something and not just reveal the mystery, which makes it far more satisfying and interesting, imo.

The only issue I had was when things are revealed about the protagonist they felt a bit glossed over or like plot points designed solely to fit into a puzzle. I wish that area had been expounded on, because they’re fairly important in characterizing both of the main characters, yet they aren’t really a part of the story being told?

It’s... a bit strange, though it’s explained by the way in which the characters must solve the mystery. Yet it’s almost a counterbalance to the point of it, since we never learn who they really are by the very nature of the structure and premise of the novel. I wonder if it’s reserved for a second book?