"The problem is to get out of here without being seen.
This offers the means.
But give me some information, in the first place. How is it managed?
Where is this coffin?"
"The empty one?"
"Yes."
"Down stairs, in what is called the dead-room. It stands on two trestles, under the pall."
"How long is the coffin?"
"Six feet."
"What is this dead-room?"
"It is a chamber on the ground floor which has a grated window opening on the garden, which is closed on the outside by a shutter, and two doors; one leads into the convent, the other into the church."
"What church?"
"The church in the street, the church which any one can enter."
"Have you the keys to those two doors?"
"No; I have the key to the door which communicates with the convent; the porter has the key to the door which communicates with the church."
"When does the porter open that door?"
"Only to allow the undertaker's men to enter, when they come to get the coffin.
When the coffin has been taken out, the door is closed again."
"Who nails up the coffin?"
"I do."