"Lady Miriam?" said Jarvis in surprise. "Oh, yes.... I suppose you mean that she looks a queer sort of vamp. But you've no notion what even the ladies of the best families are looking like nowadays. Besides, is there any particular reason for doubting their evidence?"
"Only that it brings us up against a blank wall," said Father Brown. "Don't you see that this collective alibi practically covers everybody? Those four were the only performers in the theatre at the time; and there were scarcely any servants in the theatre; none indeed, except old Sam, who guards the only regular entrance, and the woman who guarded Miss Maroni's door. There is nobody else left available but you and me. We certainly might be accused of the crime, especially as we found the body. There seems nobody else who can be accused. You didn't happen to kill him when I wasn't looking, I suppose?"
Jarvis looked up with a slight start and stared a moment, then the broad grin returned to his swarthy face. He shook his head.
"You didn't do it," said Father Brown; "and we will assume for the moment, merely for the sake of argument, that I didn't do it. The people on the stage being out of it, it really leaves the Signora behind her locked door, the sentinel in front other door, and old Sam. Or are you thinking of the two ladies in the box? Of course they might have slipped out of the box."
"No," said Jarvis; "I am thinking of the unknown woman who came and told Mandeville she was his wife."
"Perhaps she was," said the priest; and this time there was a note in his steady voice that made his companion start to his feet once more and lean across the table.
"We said," he observed in a low, eager voice, "that this first wife might have been jealous of the other wife."
"No," said Father Brown; "she might have been jealous of the Italian girl, perhaps, or of Lady Miriam Marden. But she was not jealous of the other wife."
"And why not?"
"Because there was no other wife," said Father Brown. "So far from being a bigamist, Mr. Mandeville seems to me to have been a highly monogamous person. His wife was almost too much with him; so much with him that you all charitably suppose that she must be somebody else. But I don't see how she could have been with him when he was killed, for we agree that she was acting all the time in front of the footlights. Acting an important part, too...."