This letter Nick Carter found in his mail one morning a short time ago, on coming to his breakfast table.

He read the letter with some interest, noting that it had been mailed late the afternoon before, and in the sub-district in which he lived.

Tossing it over to his wife, Edith, to read, he said:

“That might be taken for a challenge, I suppose.”

Edith read it, and replied that she should take it for an impertinence.

“Who is the Brown Robin?” she asked.

“Ah! That is the great mystery,” answered Nick.

“A woman?” asked Edith.

“When you ask that question in that way,” replied Nick, “you mean to make the statement that you believe it to be a woman.”

“Well, yes; I judge the writer of this is a woman.”