If I didn't there'd be the very devil to pay in blackmail.

如果我不这样做， 就会有魔鬼来敲诈勒索。

Why, any stranger on the street might be a murderer! If Frank ever learned the truth about Archie, there would be the devil to pay.

弗兰克要是知道了阿尔奇的真实情况，可就麻烦了。