"I wonder," said Jarvis in a meditative manner, "whether even Mandeville prefers that sort of woman."
"Well," asked his clerical companion, "have you any reason to suppose that Mandeville does prefer her?"
Jarvis looked at him steadily for an instant before answering.
"Mandeville is a mystery," he said gravely. "Oh, yes, I know that he looks about as commonplace a cad as ever walked down Piccadilly. But he really is a mystery for all that. There's something on his conscience. There's a shadow in his life. And I doubt whether it has anything more to do with a few fashionable flirtations than it has with his poor neglected wife. If it has, there's something more in them than meets the eye. As a matter of fact, I happen to know rather more about it than anyone else does, merely by accident. But even I can't make anything of what I know, except a mystery."
He looked around him in the vestibule to see that they were alone and then added, lowering his voice:
"I don't mind telling you, because I know you are a tower of silence where secrets are concerned. But I had a curious shock the other day; and it has been repeated several times since. You know that Mandeville always works in that little room at the end of the passage, just under the stage. Well, twice over I happened to pass by there when everyone thought he was alone; and what's more, when I myself happened to be able to account for all the women in the company, and all the women likely to have to do with him, being absent or at their usual posts."
"All the women?" remarked Father Brown inquiringly.
"There was a woman with him," said Jarvis almost in a whisper. "There is some woman who is always visiting him; somebody that none of us knows. I don't even know how she comes there, since it isn't down the passage to the door; but I think I once saw a veiled or cloaked figure passing out into the twilight at the back of the theatre, like a ghost. But she can't be a ghost. And I don't believe she's even an ordinary 'affair'. I don't think it's love-making. I think it's blackmail."
"What makes you think that?" asked the other.
"Because," said Jarvis, his face turning from grave to grim, "I once heard sounds like a quarrel; and then the strange woman said in a metallic, menacing voice, four words: 'I am your wife.'"