Holmes turned on his heel with a gesture of disgust. “Good night, Dr. Trevelyan,” said he.

“And no advice for me?” cried Blessington, in a breaking voice.

“My advice to you, sir, is to speak the truth.”

A minute later we were in the street and walking for home. We had crossed Oxford Street and were halfway down Harley Street before I could get a word from my companion.

“Sorry to bring you out on such a fool’s errand, Watson,” he said at last. “It is an interesting case, too, at the bottom of it.”

“I can make little of it,” I confessed.