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 his car. As I say, he was under surveillance. He was followed on that day to Monte Carlo. From there he went by road to Mentone, driving himself. His car is a very powerful one, it outdistanced his pursuers, and for about a quarter of an hour they completely lost sight of him."

"And during that time you think he concealed something by the roadside?" asked Van Aldin, keenly interested.

"By the roadside, no. Ça n'est pas pratique. But listen nowme, I have made a little suggestion to M. Carrège. He is graciously pleased to approve of it. In each Bureau de Poste in the neighbourhood it has been seen to that there is some one who knows the Comte de la Roche by sight. Because, you see, Messieurs, the best way of hiding a thing is by sending it away by the post."

"Well?" demanded Van Aldin; his face was keenly alight with interest and expectation.

"Wellvoilà!" With a dramatic flourish Poirot drew out from his pocket a loosely wrapped brown paper package from which the string had been removed.

"During that quarter of an hour's interval, our good gentleman mailed this."

"The address?" asked the other sharply.

Poirot nodded his head.

"Might have told us something, but unfortunately it does not. The package was addressed to one of these little newspaper shops in Paris where letters and parcels are kept until called for on payment of a small commission."