As for the thief, Lala Roy had no doubt at all.

It was, he was quite certain, the grandson, whose career he had watched for some years with interest and curiosity.

Who else was there who would steal the papers?
And who would help him, and give him access to the safe?
He did not only suspect, he was certain that James was in some way cognizant of the deed.

Why else did he turn so pale?
Why did he rush off to Joe's lodgings?
Why did he sit trembling?
At half-past twelve Lala Roy rose.
"It is your dinner-hour," he said to James, and it seemed to the unhappy man as it he was saying, "I know all." "It is your dinner hour; go, eat, refresh the body.

Whom should suspicion affright except the guilty ?" James put on his hat and sneaked--he felt that he was sneaking--out of the shop.
During his dinner-hour, Joseph himself called.