Nina Borg, a Danish Red Cross nurse, wife, and mother of two, is a compulsive dogooder who can't say no when someone asks for help--even when she knows better. In The Boy in the Suitcase, the New York Times bestselling thriller that introduced her to the world, Nina gets suckered into her most dangerous project yet when her friend Karin leaves her a key to a public locker in the Copenhagen train station. Inside the locker is a suitcase, and inside the suitcase is a three-year-old boy: naked and drugged, but alive. In an increasingly desperate trek across Denmark, Nina tries to figure out who the boy is, where he belongs, and who exactly is trying to hunt him down.

In Invisible Murder, the follow-up to The Boy in the Suitcase, two impoverished Roma boys are scavenging in an abandoned Soviet military facility in Hungary when they stumble upon something more valuable than they ever could have anticipated. The explosive chain of events that follows threatens the lives of hundreds of people all the way from Hungary to Denmark, where Nina is trying to treat a group of Hungarian Gypsies who are living illegally in a Copenhagen garage. What is making them so sick, and what secret are they hiding? Nina doesn't realize that she has put her own life--and her family's--on the line.