It’s every parent’s worst nightmare: a missing child. Of course, adults vanish, too. In fact, at any given time, about 100,000 Americans of all ages will go unfound. They may be runaways, or they may be lost or injured. Pettem, author of more than a dozen books, including Someone’s Daughter (2009), uses her own interviews with 22 people (along with background information from newspapers, websites, and TV shows) to explain both famous and not-so-famous abductions. Some victims survive. Who can forget Elizabeth Smart, who, at 14, was taken from her Salt Lake City home and, as she testified, repeatedly raped every day? Other victims die. Polly Klass, kidnapped at knifepoint during a slumber party when she was 12, was strangled. Pettem advises searching parents to be a 'squeaky wheel.' She also encourages them to see if their states offer Missing Persons Day events and to attend to give DNA samples and to update reports. This guidebook should empower families to never give up hope, even as Pettem reminds readers that not everyone wants to be found.