On the wall of the Countess’s boudoir was a large framed engraving.

It was a portrait.

Under it was a printed legend:

THE PRINCE OF WURTTEMBERG

The portrait was that of a Dachshund.

The long body, the broad ears, the unclipped tail, the short hind legs—all was there.

In a fraction of a second the lightning mind of the Great Detective had penetrated the whole mystery.

THE PRINCE WAS A DOG!!!!

Hastily throwing a domino over his housemaid’s dress, he rushed to the street. He summoned a passing hansom, and in a few moments was at his house.

“I have it,” he gasped to his secretary. “The mystery is solved. I have pieced it together. By sheer analysis I have reasoned it out. Listen—hind legs, hair on back, wet snout, pup—eh, what? does that suggest nothing to you?”