ran out into the street, crying out that the poor man had been killed.  Naturally a crowd rushed up in a moment, for it was in the middle of the day.  Before the injured man could make it understood who had struck him the assassin was down the street and lost in the maze of old Naples where he well knew the houses of his friends who would hide him.  The man who is known to have committed that crime—­Francesco Paoli—­escaped to New York.  We are looking for him to-day.  He is a clever man, far above the average—­son of a doctor in a town a few miles from Naples, went to the university, was expelled for some mad prank—­in short, he was the black sheep of the family.  Of course over here he is too high-born to work with his hands on a railroad or in a trench, and not educated enough to work at anything else.  So he has been preying on his more industrious countrymen—­a typical case of a man living by his wits with no visible means of support.

“Now I don’t mind telling you in strict confidence,” continued the lieutenant, “that it’s my theory that old Cesare has seen Paoli here, knew he was wanted for that murder of the old music master, and gave me the tip to look up his record.  At any rate Paoli disappeared right after I returned from Italy, and we haven’t been able to locate him since.  He must have found out in some way that the tip to look him up had been given by the White Hand.  He had been a Camorrista, in Italy, and had many ways of getting information here in America.”

He paused, and balanced a piece of cardboard in his hand.  “It is my theory of this case that if we could locate this Paoli we could solve the kidnapping of little Adelina Gennaro very quickly.  That’s his picture.”

Kennedy and I bent over to look at it, and I started in surprise.  It was my evil-looking friend with the scar on his cheek.

“Well,” said Craig, quietly handing back the card, “whether or not he is the man, I know where we can catch the kidnappers to-night, Lieutenant.”

It was Giuseppe’s turn to show surprise now.

“With your assistance I’ll get this man and the whole gang to-night,” explained Craig, rapidly sketching over his plan and concealing just enough to make sure that no matter how anxious the lieutenant was to get the credit he could not spoil the affair by premature interference.

The final arrangement was that four of the best men of the squad were to hide in a vacant store across from Vincenzo’s early in the evening, long before anyone was watching.  The signal for them to appear was to be the extinguishing of the lights behind the colored bottles in the druggist’s window.  A taxicab was to be kept waiting at headquarters at the same time with three other good men ready to start for a given address the moment the alarm was given over the telephone.

We found Gennaro awaiting us with the greatest anxiety at the opera-house.  The bomb at Cesare’s had been the last straw.  Gennaro had already drawn from his bank ten crisp one-thousand-dollar bills, and already had a copy of Il Progresso in which he had hidden the money between the sheets.