It could only have lasted a minute or so, but was so terribly vivid that Prelice could scarcely believe that his surroundings were real when the material asserted its sway. He had closed his eyes to behold the vision, which the scent had invoked, and opened them again, with a bewildered expression, to see the pushing, laughing, chattering throng of guests. Although a commonplace young man, and contemptuous, as a rule, of the unseen, he felt that the recollection had not been brought back for nothing. The dead man at Lanwin Grange had been reading about Easter Island when foully stabbed, and the accused girl had described to her lover the white smoke and sickly perfume, which also had to do with that isolated land. And Mona also--Prelice remembered faithfully what Shepworth had told him--had been in a state of catalepsy, like the priest of the vision. And, after all, although he chose to call what he had seen mentally a vision, it was simply a vivid recollection of what he and Dr. Horace had beheld a year or two before. But what had a fetish worship in Easter Island to do with a murder in Kent? That was a question which Prelice could not answer. There was no time to invent possible explanations or to reason out answers. Being in Rome, the momentary dreamer had to do as the Romans did; and as Prelice was at a ball, he was compelled, out of courtesy to his hostess and host, to enjoy himself. He did not have far to go for an adventure, as a lady in a blue domino, and with a fringed mask to disguise her voice, stole to his side, and engaged him in airy conversation. Who she was the young man did not know, and probably she was equally ignorant of his identity. But on this especial night, Mrs. Rover's flat was Liberty Hall with a vengeance, for men and women, trusting in masks and dominos for concealment, flirted and danced and drank and laughed with one another in a most outrageous manner. There was no need of introductions, or of reticence, or of timidity; in that Eden's Bower of flowers and ferns faces were hidden, but souls were revealed. The blue domino proved to be a most charming companion, full of fun and flirtation, and a delightful dancer. Prelice found her extremely entertaining, and she appeared to reciprocate the feeling. After a particularly perfect waltz, and an inspiriting glass of champagne, his lordship did his best to lure the unknown into a corner where she might unmask. But the lady shook her head laughingly, and ran off to the ballroom with another man, whose stature of a life-guardsman had caught her roving eyes. Prelice solaced himself with another glass of wine, and looked about him for another female of man. It was then that a chuckle at his elbow made him turn. "Now then, now then," said the gentleman who had chuckled, "let me come to refresh myself." He spoke irritably, and pushed past Prelice in a hurry. "Waiter! Waiter, a glass of champagne." "I thought you were a teetotaler, uncle!" whispered Prelice.