Marquet had them arrested at once."

"If they had been accomplices," said Rouletabille, "they would not have
been there at all. When people throw themselves into the arms of justice
with the proofs of complicity on them, you can be sure they are not
accomplices. I don't believe there are any accomplices in this affair."

"Then, why were they abroad at midnight? Why don't they say?"

"They have certainly some reason for their silence. What that reason is,
has to be found out; for, even if they are not accomplices, it may be of
importance. Everything that took place on such a night is important."

We had crossed an old bridge thrown over the Douve and were entering the
part of the park called the Oak Grove, The oaks here were centuries
old. Autumn had already shrivelled their tawny leaves, and their high
branches, black and contorted, looked like horrid heads of hair, mingled
with quaint reptiles such as the ancient sculptors have made on the head
of Medusa. This place, which Mademoiselle found cheerful and in which
she lived in the summer season, appeared to us as sad and funereal now.
The soil was black and muddy from the recent rains and the rotting of
the fallen leaves; the trunks of the trees were black and the sky above
us was now, as if in mourning, charged with great, heavy clouds.

And it was in this sombre and desolate retreat that we saw the white
walls of the pavilion as we approached. A queer-looking building without
a window visible on the side by which we neared it. A little door alone
marked the entrance to it. It might have passed for a tomb, a vast
mausoleum in the midst of a thick forest. As we came nearer, we were
able to make out its disposition. The building obtained all the light it
needed from the south, that is to say, from the open country. The little
door closed on the park. Monsieur and Mademoiselle Stangerson must have
found it an ideal seclusion for their work and their dreams.

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