Not sure if this is the right place on the forum to post this (is there a right place to solicit advice on these matters?), but here goes: We live in a seventh floor apartment in a city center block in Seoul, South Korea. The elevator comes up to the seventh floor, where there is our apartment, another apartment across a narrow lobby; and the stairwell. That's it. My daughter Hannah (12-years-old) was home alone after school this afternoon, when there came a knock on the door, which is metal and pretty sturdy, and which has a self-locking device. Before she opened the door or answered, she looked through the peephole: It was covered (probably with the hand of the guy outside). Again he knocked: She did not answer but turned on the TV to make a noise. When she looked through the peephole again, she could see a shirt button: Obviously he was standing directly in front of the door. The guy kept knocking, but did not speak, and Hannah did not challenge him verbally. She did open the door a crack (with the catch-lock still in place) and snatched a glimpse of a guy in dark clothes, with a baseball cap pulled down over his eyes and a surgical mask on his face. (The latter is quite common in Korea, but is also, of course, very handy for anyone who does not want to be IDed). Only when Hannah pretended (loudly) to call the police on the telephone did the guy disappear. This happened late this afternoon, and lasted around 30 minutes, by Hannah's reckoning. My wife will be making a report to apartment security tomorrow morning. Hannah did the right thing by keeping the door closed, but I have told her if this happens again, call the police for real. If, when she is doing that, he tries to break in, she can open the windows and shout for help, giving our apartment number - there are always people outside, down below. I have also told her not to leave even if you think he has gone - call the apartment security before you open the door. And the missus will walk Hannah to school for the rest of the week just in case. Very obviously, this guy was up to something: At best, he was a prospective burglar. At worst...well. Any comments or advice from anyone with police, security or other relevant experience would be appreciated.