Sherlock Holmes, Dr. Watson, and Davy Wiggins in the Deliver Us From Evil Series:
[Holmes] would have died for a secret. But he will live now, for a friend.
Watson: "Porlock, there is no use in arguing the point. I shall search for Holmes. Whether you help me or not is your choice, but you shan't stop me — you have my word on that."
Wiggins: "Mum, I've been running that risk ever since I was a mite. I can't tell you what I'm doing, but I need to see it through. Peter's a fine young man, and he'll take good care of you. I'll come back if I can, I promise."