"You see, we know these people, more or less. That Socialist would no more steal a diamond than a Pyramid. We ought to look at once to the one man we don't know. The fellow acting the policeman --Florian. Where is he exactly at this minute, I wonder."The pantaloon sprang erect and strode out of the room. An interlude ensued, during which the millionaire stared at the priest, and the priest at his breviary; then the pantaloon returned and said, with staccato gravity, "The policeman is still lying on the stage. The curtain has gone up and down six times;he is still lying there."

Father Brown dropped his book and stood staring with a look of blank mental ruin. Very slowly a light began to creep in his grey eyes, and then he made the scarcely obvious answer.

"Please forgive me, colonel, but when did your wife die?""Wife!" replied the staring soldier, "she died this year two months. Her brother James arrived just a week too late to see her."The little priest bounded like a rabbit shot. "Come on!" he cried in quite unusual excitement. "Come on! We've got to go and look at that policeman!"They rushed on to the now curtained stage, breaking rudely past the columbine and clown (who seemed whispering quite contentedly), and Father Brown bent over the prostrate comic policeman.

"Chloroform," he said as he rose; "I only guessed it just now."There was a startled stillness, and then the colonel said slowly, "Please say seriously what all this means."Father Brown suddenly shouted with laughter, then stopped, and only struggled with it for instants during the rest of his speech.

"Gentlemen," he gasped, "there's not much time to talk. I must run after the criminal. But this great French actor who played the policeman--this clever corpse the harlequin waltzed with and dandled and threw about--he was--" His voice again failed him, and he turned his back to run.

"He was?" called Fischer inquiringly.

"A real policeman," said Father Brown, and ran away into the dark.

There were hollows and bowers at the extreme end of that leafy garden, in which the laurels and other immortal shrubs showed against sapphire sky and silver moon, even in that midwinter, warm colours as of the south. The green gaiety of the waving laurels, the rich purple indigo of the night, the moon like a monstrous crystal, make an almost irresponsible romantic picture; and among the top branches of the garden trees a strange figure is climbing, who looks not so much romantic as impossible. He sparkles from head to heel, as if clad in ten million moons; the real moon catches him at every movement and sets a new inch of him on fire.

But he swings, flashing and successful, from the short tree in this garden to the tall, rambling tree in the other, and only stops there because a shade has slid under the smaller tree and has unmistakably called up to him.

"Well, Flambeau," says the voice, "you really look like a Flying Star; but that always means a Falling Star at last."The silver, sparkling figure above seems to lean forward in the laurels and, confident of escape, listens to the little figure below.