Here’s a tip: if you want to disappear and assume a new identity, don’t befriend children and become their mentor. Inevitably they will discover you have a mystery past that you don’t want to talk about. And children are really, really good at uncovering things adults don’t want them to know. It’s like a sixth sense most of us lose at puberty—the moment an adult evades a question, the child files it away under, “I…