She cast a parting glance in the mirror and went out, shutting the door behind her.

A moment more, and Marius heard the sound of the two young girls’ bare feet in the corridor, and Jondrette’s voice shouting to them:—

“Pay strict heed! One on the side of the barrier, the other at the corner of the Rue du Petit-Banquier. Don’t lose sight for a moment of the door of this house, and the moment you see anything, rush here on the instant! as hard as you can go! You have a key to get in.”

The eldest girl grumbled:—

“The idea of standing watch in the snow barefoot!”

“To-morrow you shall have some dainty little green silk boots!” said the father.

They ran downstairs, and a few seconds later the shock of the outer door as it banged to announced that they were outside.

There now remained in the house only Marius, the Jondrettes and probably, also, the mysterious persons of whom Marius had caught a glimpse in the twilight, behind the door of the unused attic.

CHAPTER XVII—THE USE MADE OF MARIUS’ FIVE-FRANC PIECE

Marius decided that the moment had now arrived when he must resume his post at his observatory. In a twinkling, and with the agility of his age, he had reached the hole in the partition.