"Another whom she favoured. The letters found in her possession - not the ones she wrote herself, but those which were written to her over the signature 0. B. were not all from the same hand. Experts have been busy with them for a week, and their reports are unanimous. The 0. B. who wrote the threatening lines acknowledged to by Orlando Brotherson, was not the 0. B. who penned all of those love letters. The similarity in the writing misled us at first, but once the doubt was raised by Mr. Challoner's discovery of an allusion in one of them which pointed to another writer than Mr. Brotherson, and experts had no difficulty in reaching the decision I have mentioned."

"Two 0. B.s! Isn't that incredible, Mr. Gryce?"

Yes, it is incredible; but the incredible is not the impossible. The man you've been shadowing denies that these expressive effusions of Miss Challoner were meant for him. Let us see, then, if we can find the man they were meant for."

Sweetwater's face instantly lit up.

"Do you mean that I - after my egregious failure - am not to be kept on the dunce's seat? That you will give me this new job?"

"Yes. We don't know of a better man. It isn't your fault, you said it yourself, that water couldn't be squeezed out of a millstone."

"The Superintendent - how does he feel about it?"

"He was the first one to mention you."