"Some one has been here in our absence."

"Impossible!"

It was not impossible--it was true. When Gevrol had torn the apron
off Widow Chupin's head he had thrown it upon the steps of the stairs;
neither of the police agents had since touched it. And yet the pockets
of this apron were now turned inside out; this was a proof, this was
evidence. At this discovery Lecoq was overcome with consternation, and
the contraction of his features revealed the struggle going on in
his mind. "Who could have been here?" he murmured. "Robbers? That is
improbable."

Then, after a long silence which his companion took good care not to
interrupt, he added: "The person who came here, who dared to penetrate
into this abode and face the corpses of these murdered men--this person
could have been none other than the accomplice. But it is not enough to
suspect this, it is necessary to know it. I must--I will know it!"

They searched for a long time, and it was not until after an hour of
earnest work that, in front of the door forced open by the police, they
discovered in the mud, just inside the marks made by Gevrol's tread, a
footprint that bore a close resemblance to those left by the man who
had entered the garden. They compared the impressions and recognized the
same designs formed by the nails upon the sole of the boot.

"It must have been the accomplice!" exclaimed Lecoq. "He watched us,
he saw us go away, and then he entered. But why? What pressing,
irresistible necessity made him decide to brave such imminent danger?"