Read it through once

‘Here’s the house broken into,’ said the doctor, ‘and a couple of men catch one moment’s glimpse of a boy, in the midst of gunpowder smoke, and in all the distraction of alarm and darkness. Here’s a boy comes to that very same house, next morning, and because he happens to have his arm tied up, these men lay violent hands upon him--by doing which, they place his life in great danger--and swear he is the thief. Now, the question is, whether these men are justified by the fact; if not, in what situation do they place themselves?’