Did you ever stop reading suddenly and return to reread a sentence, possibly more than once, and consider how it was written and whether it even made sense?
I do this all the time. Just this morning while reading Anne Perry, one of the posh characters responded to Inspector Pitt:
I'm sorry you have taken the trouble to return, since I'm quite sure I can tell you nothing more.
Is this little piece of dialogue grammatically correct? Is it logically correct? Since this sentence is a part of the dialogue spoken by Charlotte Ellison, it, arguably, could be purposely incorrect in order to display the character’s less-than-perfect speech or it could be acceptable every-day grammar that we see or hear without stopping to consider what it really means.
My question is: how do you tell someone nothing more?
I can’t think of anything more to say so I’ll just leave the question for individual contemplation.