A Shilling for Candles

From Josephine Tey, A Shilling for Candles, 1936:

And for a moment doubt stirred in Grant. That had been beautifully done. Time, expression, action. No professional actor could have done it better. But the doubt passed. He recrossed his legs, by way of shaking himself, recalled the charm and innocence of murderers he had known (Andew Hamey, who specialised in marrying women and drowning them and who looked like a choir soloist, and others of even greater charm and iniquity) and then composed his mind to the peace of a detective who has got his man.

"So you were wrong, and it's all right! You were wrong, and it's all right!