I really enjoyed Mr. Penumbra! Any chance on continuing the story?
I went back in time and filled in some backstory with the short prequel 'Ajax Penumbra 1969.' As of this moment, I have no plans to expand the Penumbra-verse… but, you never know! When I wrote the original 'Penumbra' short story, I never imagined it would be a full-length novel. Anything can happen.