Witchcraft is a practice which remains common in some parts of Africa. At its darkest, its rituals include violence against women and children.
When she was 17, Rose Nanyonga Clarke refused to join her family's use of witchcraft and instead walked from her Ugandan village to a new life.
She is now studying at Yale University School of Nursing. Last summer she organized a trip back to Uganda to retrace her 32-mile journey to freedom.
The trip had three goals: to create a scholarship fund for future Ugandan nurses, to raise funds for the International Hospital Kampala, and to raise awareness about child sacrifice.
Rose was recently interviewed by BBC News. Click to watch her first-person account.