I had to switch off the audio narration and go straight to the book. Patience Tomlinson's narration does not work for me. At all. I had the same issue with one the Gladys Mitchell books she narrated, then skipped the audio books completely and moved to the book, too.
As for the story, ... this one isn't bad but the level of detail is not keeping my interest either, and there isn't anything in the way of wit or writing that stands out for me.
I'll be glad to finish this one and move on.
I do have another Farjeon lined up...