When 14-year-old-Johanna learns that her orphanage is experimenting on babies, she kidnaps one of them and sets off for Amsterdam.

Johanna is a 14-year-old Jewish girl who lives in Hamburg, Germany, in the early 18th century. She feels stifled by the daily drudgery of her life and dreams of seeing what lies outside the confines of the Jewish quarter. Johanna lies about her identity and gets a job as a caregiver at an orphanage. Until it's too late, she doesn't realize a secret experiment is taking place that results in the deaths of babies.

Deciding to kidnap one of the orphans, Johanna sets off for Amsterdam. She faces many dangers on her journey, including plague, bandits, storms and, not least of all, anti-Semitism. Johanna has a lot of courage and determination, but will it be enough to save the baby and reach her destination? Will she finally find a place where she can be free?