Demons are a Ghoul's Best Friend

The mix of lighthearted detective work with ghosts and demons makes for a unique tone. I'm curious what inspired this particular mashup.

The book manages to be funny while dealing with supernatural mysteries, which can be tricky. Did the humor feel natural to others, or was it jarring at times?

The world-building felt so seamless and charming. I wonder if the author envisioned this universe from the start or let it develop organically.