They entered a large bare room occupied by a couple of clerks, and meagrely furnished with a stool, a table, and a few rush-bottomed chairs. Chémerault offered a seat to his prisoner, who sat down without uttering a word. He was convinced that it was useless to struggle, and thought only of what crime could possibly be brought against him.

The clerks regarded the advent of the party with perfect indifference. They had seen many other well-dressed young men in a similar predicament, and after a casual glance at the prisoner continued their writing.

The detective asked them if the chief was in, and on their answering affirmatively, he went into an anteroom separating the outer one from the private office of the head of the department, and, after tapping at the door, entered.

Ten minutes later he emerged from the private room, and, after giving some instructions to the clerks, ordered the prisoner to accompany him into the presence of the chief.

During the brief interval which elapsed between the detective’s exit and the prisoner’s entry, the director of criminal investigations prepared himself for the interrogation. In the first examination, the advantage always lies with the examiner. The accused is unaware what mode of attack his interrogator is adopting, and cannot guess what points his replies are required to prove. The one is cool and calculating, the other confused, embarrassed, and dreading lest he should make any reply that may tell against him. The combat is by no means equal.

The chief, after reflection, looked steadily at the photograph which Chémerault had handed to him, then taking a bundle of blue papers from a pigeonhole at his elbow, untied the tape which bound them, and spread them out before him.

Just as he had done this the door opened and Hugh Trethowen advanced, conducted by the detectives.

“You may be seated, m’sieur,” said the director of criminal investigations politely.

Hugh bowed stiffly, took the chair, and, striving to appear calm, waited to be questioned.

The chief did not commence at once. He always delayed his questions for a few moments in order to ascertain the sort of man with whom he had to deal. He looked at the prisoner and their eyes met. The doubts he had entertained with regard to the photograph were instantly removed. With that special memory for faces which an expert engaged in the investigation of crime acquires by long practice, he recognised the features of the accused, and in a moment decided how he should examine him and the principal points for confirmation.