If he did it in the light, the doctor might recognize him as the Chicago reporter, and would know at once that he was no detective.

Still, he felt that if there was anything in his scheme at all, it was surprise; and he remembered the quick gasp of the lawyer Brown when he told him he knew what his defence was.

He must be able to note the expression of the man who was guilty of the terrible crime.
Having made up his mind to this, he stepped smartly after the doctor, and, when the latter came under a lamp-post, placed his hand suddenly on his shoulder, and exclaimed-- "Doctor Stephen Roland, I arrest you for the murder of William Brenton!".