There were two things which Mr. Desrolles did not know; first, that his new friend was a distinguished member of the Parisian swell-mob, and was constantly under the surveillance of the police; secondly, that he himself had been watched and followed by an English detective ever since he left the Quai des Grands Augustins, which English detective knew all about Mr. Desrolles’ intended voyage in the Reine Blanche.

Desrolles went home to his lodging, not too steady of foot, soon after midnight. He was prepared to encounter some slight difficulty in opening the door with his pass-key, and was pleased at finding that some other night-bird, returning to his nest a little earlier, had left the door ajar. He had only to push it open and go in.

Within all was gloom, save in one corner by the portress’s den, where a glimmer of gas showed the numbered board whereon hung the keys which admitted the lodgers to their several apartments. But Desrolles knew every twist of the corkscrew staircase. Drunk as he was, he wound his way up safely enough, with only an occasional lurch and an occasional stumble. He managed to unlock the door of his room, after trying the key upside down once or twice, and making some circuitous scratchings on the panel. He managed to strike a lucifer and light his candle, leaning against the mantelpiece as he performed that feat, and giving a drunken chuckle when it was done. But his nerves must have been in a very shaky condition, for when a man, who had crept softly into the room behind him, laid a strong hand upon his shoulder, he collapsed, and made as if he would have fallen to the ground. ‘What do you want?’ he asked in French.

‘You,’ answered the intruder in English. ‘I arrest you on suspicion of being concerned in the murder of La Chicot. You know all about it. You were examined at the inquest. Anything you say now will be used as evidence against you. You had better come quietly with me.’

‘I don’t understand you,’ said Desrolles, still in French. ‘I am a Frenchman.’

‘Oh, very much of that. You’ve been lodging here three weeks. You are known to be an Englishman. You took your passage to-day for Valparaiso. I called at the office to make inquiries an hour after you left it. No nonsense, Mr. Desrolles. All you’ve got to do is to come quietly with me.’

‘You’ve got some one else outside, I suppose,’ said Desrolles, with a savage glare at the door.

His expression in this moment was diabolical; a wild beast—a beast of a low type, not your kingly lion or your lordly tiger—at bay and knowing escape impossible, might so look; the thin lips curling upward above the long sharks’ teeth; the grizzled brows contracted—the eyes emitting sparks of lurid light.

‘Of course,’ answered the man coolly. ‘You don’t suppose I should be such a fool as to trust myself in a hole like this without help. I’ve got my mate on the landing, and we’ve both got revolvers. Ah, none of that now,’ ejaculated the detective suddenly, as Desrolles plunged his lean hand into his breast pocket. ‘Stow that, now. Is it a knife?’

It was a knife, and a murderous one. Desrolles had it out, and the long-pointed blade ready, before his captor could stop him. The man sprang upon him, caught him by the wrist, before the knife could do mischief; and then the two closed, hand against hand, limb against limb, Desrolles wrestling with his foe as only rage and despair can wrestle.