I'm a bit late to the discussion, sorry!
I have to say I really struggled with reading this book - there seems to be so many unnecessary explanations/asides (more "telling" than "showing" writing). But listening to the Audible version on my commutes was more tolerable, so I made it to the end
I liked the bones of the story, but then I am a fan of traditional English mystery. But this book just had too much "clutter" and explanations. The ending was a bit Christie-like with lots of info, but way too long and convoluted. Or something. I just couldn't get in to this story or connect to the characters. I got impatient reading, and actually speed read some sections.
I am intrigued by how the relationship between Peter and Bunter might evolve in future books.