, a sewer is not the Champ de Mars.
One lacks everything there, even room.
When two men are there, they must meet.
That is what happened.
The man domiciled there and the passer-by were forced to bid each other good-day, greatly to the regret of both.
The passer-by said to the inhabitant:--"You see what I have on my back, I must get out, you have the key, give it to me."
That convict was a man of terrible strength.
There was no way of refusing.
Nevertheless, the man who had the key parleyed, simply to gain time.
He examined the dead man, but he could see nothing, except that the latter was young, well dressed, with the air of being rich, and all disfigured with blood.
While talking, the man contrived to tear and pull off behind, without the assassin perceiving it, a bit of the assassinated man''s coat.
A document for conviction, you understand; a means of recovering the trace of things and of bringing home the crime to the criminal.
He put this document for conviction in his pocket.
After which he opened the grating, made the man go out with his embarrassment on his back, closed the grating again, and ran off, not caring to be mixed up with the remainder of the adventure and above all, not wishing to be present when the assassin threw the assassinated man into the river.
Now you comprehend.