Read it through once

‘The short and the long of what you mean,’ said Nancy: speaking very emphatically, and slightly frowning at Oliver as if to bespeak his serious attention to her words: ‘is, that if you’re crossed by him in this job you have on hand, you’ll prevent his ever telling tales afterwards, by shooting him through the head, and will take your chance of swinging for it, as you do for a great many other things in the way of business, every month of your life.’