P. G. Wodehouse 
My Man Jeeves [EPUB ebook] 

Jeeves—my man, you know—is really a most extraordinary chap. So capable. Honestly, I shouldn't know what to do without him. On broader lines he's like those chappies who sit peering sadly over the marble battlements at the Pennsylvania Station in the place marked "Inquiries." You know the Johnnies I mean. You go up to them and say: "When's the next train for Melonsquashville, Tennessee?" and they reply, without stopping to think, "Two-forty-three, track ten, change at San Francisco." And they're right every time. Well, Jeeves gives you just the same impression of omniscience.