"I shall probably wish to go over the outside of the house again.

Perhaps I had better take a look at the lower windows before I go up." He walked swiftly round from one to the other, pausing only at the large one which looked from the hall onto the stable lane.
This he opened and made a very careful examination of the sill with his powerful magnifying lens.

"Now we shall go upstairs," said he at last.
The banker's dressing-room was a plainly furnished little chamber, with a grey carpet, a large bureau, and a long mirror.
Holmes went to the bureau first and looked hard at the lock.
"Which key was used to open it ?" he asked.
"That which my son himself indicated--that of the cupboard of the lumber-room." "Have you it here ?" "That is it on the dressing-table." Sherlock Holmes took it up and opened the bureau.
"It is a noiseless lock," said he.

"It is no wonder that it did not wake you.

This case, I presume, contains the coronet.