~てみる is a specific grammar meaning "to try" (in the sense of "try it and see what happens", not in the sense of "try to do something that may or may not be possible").
There should be a section on it in Genki, but in any case, there's this:
That kind of use of 'see' is very similar to this use of 「みる」, yes, although I think it is probably closer to "I came to see about questioning you on your connection to Yukishiro Enishi". The difference is not large, anyway.
Without knowing the exact situation or how the sentence concludes, I can't really say if that's exactly right. If the sentence doesn't end at が, then the rest of the sentence could shade the meaning very differently, and also probably contains the information that explains what the は is doing in the middle of the ~てみる.