OLIVIA (at the left window): He isn't a policeman, as a matter of fact. He must be a plain-clothes man.
MRS. TERENCE (sardonically): Scotland Yard, I should think.
BELSIZE is seen outside, crossing the left window to the front door.
MRS. BRAMSON: That place in those detective books? Don't be so silly.
MRS. TERENCE: He says he wants to see you very particular—
_A sharp rat-tat at the front door.
(Going to the hall_) On a very particular matter…. (Turning on MRS. BRAMSON) And don't you start callin' me silly!
Going to the front door, and opening it.
This way, sir….
BELSIZE enters, followed by MRS. TERENCE. He is an entirely inconspicuous man of fifty, dressed in tweeds: his suavity hides any amount of strength.