Status Updates From Black Coffee: A Mystery Pla...

(There is a knock at the hall door.)
POIROT. The police! We have very little time. Madame, I make you two promises. Promise number one - I will save you ...
...
POIROT. Promise number two , I will save your husband!
(LUCIA cries wildly.)
LUCIA. Oh!
(TREDWELL enters from the hall [and announces].)
TREDWELL. Inspector Japp.

HASTINGS. But on the whole I plump for the Italian.
POIROT. The mysterious Dr. Carelli.
HASTINGS. Mysterious. That's just the word. What is he doing down here? Of course, he was after the formula - emissary of a foreign government. You know the stuff.
POIROT. I do occasionally go to the cinema - yes!

RICHARD. May we ask the meaning of all this?
SIR CLAUD. I am about to explain. To begin with, as you know, those two doors are locked on the outside. From my study there is no way out except through this room. The windows are locked with a patent device of my own. This place is a rat-trap.
It is now ten minutes to nine. At a few minutes past nine the rat-catcher will arrive.