He was thrilled with his discovery. For a moment the whole affair seemed clear, but once again second thoughts showed him there was a good deal still to be explained. However, once he had got rid of this Dubois, he would see just where he stood.
He questioned the carter exhaustively, but without gaining much further information. That the man had no idea of the identity of his seducer was clear. The only name he had got hold of was that of Dupierre, for Boirac had instructed him to say at his house that he had called for Messrs. Dupierre’s cask. Asked if he had not seen the advertisements of rewards for the information he had now given, the man said he had, but that he was afraid to come forward. First he feared he would lose his job if the matter came to his employer’s ears, and then the very fact that so large a reward was offered had frightened him, as he assumed he had unwittingly helped with some crime. He had suspected the matter was one of robbery until he saw of the discovery of the cask in the papers. Then he had at once guessed that he had assisted a murderer to dispose of his victim’s body, and he had lived in a veritable nightmare lest his share in the business should be discovered. Failing to get anything further out of him, La Touche finally dismissed him somewhat contemptuously with his hundred francs. Then he settled himself to try and puzzle out his problem.
And first as to the movements of the cask. It had started from Boirac’s house; how did it get there? Clearly from Dupierre’s. It must have been the cask in which Boirac’s statue had been sent home. That cask, then, left Dupierre’s on the Saturday of the dinner party, reaching Boirac’s house the same day. It lay there until the following Thursday. During that time the statue was taken out and the body substituted. The cask then travelled to London, was taken by Felix to St. Malo, and finally got into the hands of the police at Scotland Yard.
But then, what about the cask which was met at Waterloo and sent back from London to the Gare du Nord?
This, La Touche saw, must have been a different cask, and there must therefore have been two moving about, and not one as they had believed. He tried to follow the movements of this second cask. It left Dupierre’s on the Tuesday evening, reached Waterloo on the following morning and on next day, Thursday, was sent back to Paris, reaching the Gare du Nord at 4.45 p.m. It had always been assumed this cask went from there to the rue Cardinet Goods Station. This was now proved to have been an error. Where, then, did it go?
Like a flash La Touche saw. It had gone from the Gare du Nord to Dupierre’s. He looked up his chronology of the case. Yes a cask had been received by Dupierre on that Thursday evening, but they had believed it had come from Boirac’s house. And then the whole diabolical plot began dimly to appear, as La Touche endeavoured to picture the scene which had probably taken place.
Boirac, he conjectured, must have discovered his wife has eloped with Felix. Mad with jealousy and hatred he kills her. Then, cooling down somewhat, he finds himself with the body on his hands. What is he to do with it? He thinks of the cask standing in the study. He sees that a better receptacle for getting the body out of the house could hardly be devised. He therefore unpacks the statue and puts in the body. The question then arises, where is he to send it? A horrible idea occurs to him. He will wreak his vengeance on Felix by sending it to him. And then a second idea strikes him. If he could arrange that the police would find the body in Felix’s possession, would the artist not then be suspected and perhaps executed? Truly a ghastly vengeance! Boirac then types the Le Gautier letter, and sends it to Felix with the idea of making the artist act in so suspicious a way that the police will interfere and find him with the body.
So far La Touche felt his surmises had a ring of probability, but he was still puzzled about the second cask. But, as he turned the matter over in his mind, he gradually began to see light here too.
Boirac had received a cask from Dupierre with his statue. But as it had gone to Felix he had no empty cask to send back in its place to the sculptors. He must return them an empty cask, or else suspicion falls on him at once. Where is he to get it?
And then La Touche saw that the whole business of the second cask must have been arranged simply to meet this difficulty. Boirac must have ordered it, forging Felix’s handwriting. La Touche recollected that order was written on the same paper as the Le Gautier letter, suggesting a common origin for both. Boirac met it in London, took it to the shed, there removed and destroyed the statue, and had the cask returned to Paris. At the Gare du Nord he doubtless changed the labels, so that when it reached Dupierre’s it bore that with the address of his own house. The other label he must have altered from the Waterloo route to that of long sea. This would account for Dubois’s statement that Boirac had changed the labels when he met him in the rue de La Fayette, as well as for the curious faking of that described by the clerk Broughton.