Reading progress update: I've read 22%.

“I say ‘No,’” repeated Mrs. Davis, nodding her head very violently.
“No to what?” asked the Inspector, still puzzled.
“I say, if you ask me if he’s the murderer, I say ‘No!’”
“Oh! I see, but I never suggested anything of the kind.”
“Not in words, but it’s what it comes to. Cut the cackle and come to the horses, as Mr. Davis used to say. I’m never one for beating about the bush.”
Ok, ok, Dame Agatha must have had fun with this one. It certainly reads like she wrote this chapter with a twinkle in her eye.
Mrs. Davis sounds like a fun character.
Oh, and I am already looking forward to using "cut the cackle and come to the horses" in whatever next work meeting goes around in circles.