Here's a sentence:
By George, I'll see this case through to a finish!
These are the words of a detective (written in 1912)
I am translating a story and there is that phrase, I can't be sure what emotions that man showed (put) when was saing it. An astonishment or approval? Please, can someone explain it to me, maybe rephrase it for I could catch the real meaning in a simple way. Thank you in advance