“Looking back on my solo travel days (in the early 1990s), I was really lucky and very naive,” she writes. “I gave entirely too much information about myself to complete strangers. … I was way too trusting and not plugged into my surroundings.” Times have changed, she writes. “Back then I didn’t feel I had to be switched on, with my radar scanning at all times, when I was by myself. However, it’s no longer an option NOT to take proactive measures to keep yourself safe.” Producing the 2006 documentary “Terror in American Schools: Are Your Kids Safe?” prompted her...