saw, I’ll take my hat off to you on that’”
“‘You have ordered handcuffs put on a prisoner for the last time’”
“‘No, no, no!’ he shrieked.  ‘You dogs!  You cowards!’”
“‘What’s the matter?  Your eyes are shut’”
“And a moment later he had carried her safely through the flames”

CHAPTER I

A BLOOD-RED SKY

It is worthy of note that the most remarkable criminal case in which the famous French detective, Paul Coquenil, was ever engaged, a case of more baffling mystery than the Palais Royal diamond robbery and of far greater peril to him than the Marseilles trunk drama—­in short, a case that ranks with the most important ones of modern police history—­would never have been undertaken by Coquenil (and in that event might never have been solved) but for the extraordinary faith this man had in certain strange intuitions or forms of half knowledge that came to him at critical moments of his life, bringing marvelous guidance.  Who but one possessed of such faith would have given up fortune, high position, the reward of a whole career, simply because a girl whom he did not know spoke some chance words that neither he nor she understood.  Yet that is exactly what Coquenil did.

It was late in the afternoon of a hot July day, the hottest day Paris had known that year (1907) and M. Coquenil, followed by a splendid white-and-brown shepherd dog, was walking down the Rue de la Cite, past the somber mass of the city hospital.  Before reaching the Place Notre-Dame he stopped twice, once at a flower market that offered the grateful shade of its gnarled polenia trees just beyond the Conciergerie prison, and once under the heavy archway of the Prefecture de Police.  At the flower market he bought a white carnation from a woman in green apron and wooden shoes, who looked in awe at his pale, grave face, and thrilled when he gave her a smile and friendly word.  She wondered if it was true, as people said, that M. Coquenil always wore glasses with a slightly bluish tint so that no one could see his eyes.

The detective walked on, busy with pleasant thoughts.  This was the hour of his triumph and justification, this made up for the cruel blow that had fallen two years before and resulted, no one understood why, in his leaving the Paris detective force at the very moment of his glory, when the whole city was praising him for the St. Germain investigation. Beau Cocono! That was the name they had given him; he could hear the night crowds shouting it in a silly couplet: 

    Il nous faut-o
    Beau Cocono-o!

And then what a change within a week!  What bitterness and humiliation!  M. Paul Coquenil, after scores of brilliant successes, had withdrawn from the police force for personal reasons, said the newspapers.  His health was affected, some declared; he had laid by a tidy fortune and wished to enjoy it, thought others; but many shook their heads mysteriously and whispered that there was something queer in all this.  Coquenil himself said nothing.