Oysters had just given place to Sole Colbert when a card was brought to Hersheimmer.
"Inspector Japp, C.I.D. Scotland Yard again. Another man this time. What does he expect I can tell him that I didn't tell the first chap?
Agatha Christie - The Secret Adversary
I forgot that Japp is in this one, even tho it is a Tommy and Tuppence and not a Poirot adventure.