The thing became an obsession. Not only his honour but his future was at stake. If he discovered the thief, he would be the most talked of person in Perpignan. He would know how to improve his position. He would rise to dizzy heights. Perpignan-Ville de Plaisir would acclaim him as its saviour. The Government would decorate him. And finally, both the Mayor and Madame Coquereau would place the blushing and adorable Mademoiselle Stéphanie in his arms and her two hundred and fifty thousand francs dowry in his pocket. Never before had so dazzling a prize shimmered before him in the near distance. On the last Saturday night of the Carnival, there was a special _corso_ for the populace in the Avenue des Plantanes, the long splendid Avenue of plane trees just outside the Porte Notre Dame, which is the special glory of Perpignan. The masquers danced to three or four bands. They threw confetti and _serpentins_. They rode hobby-horses and beat each other with bladders. They joined in bands of youths and maidens and whirled down the Avenue in Bacchic madness. It was a _corso blanc_, and everyone wore white--chiefly modifications of Pierrot costume--and everyone was masked. Chinese lanterns hung from the trees and in festoons around the bandstands and darted about in the hands of the revellers. Above, great standard electric lamps shed their white glare upon the eddying throng casting a myriad of grotesque shadows. Shouts and laughter and music filled the air. Aristide in a hideous red mask and with a bag of confetti under his arm, plunged with enthusiasm into the revelry. To enjoy yourself you only had to throw your arm round a girl's waist and swing her off wildly to the beat of the music. If you wanted to let her go you did so; if not, you talked in the squeaky voice that is the recognized etiquette of the carnival. On the other hand any girl could catch you in her grip and sweep you along with her. Your mad career generally ended in a crowd and a free fight of confetti. There was one fair masquer, however, to whom Aristide became peculiarly attracted. Her movements were free, her figure dainty and her repartee, below her mask, more than usually piquant. "This hurly-burly," said he, drawing her into a quiet eddy of the stream, "is no place for the communion of two twin souls." "_Beau masque_," said she, "I perceive that you are a man of much sensibility." "Shall we find a spot where we can mingle the overflow of our exquisite natures?" "As you like." "_Allons! Hop!_" cried he, and seizing her round the waist danced through the masquers to the very far end of the Avenue. "There is a sequestered spot round here," he said. They turned. The sequestered spot, a seat beneath a plane tree, with a lonesome arc-lamp shining full upon it, was occupied. "It's a pity!" said the fair unknown.