In Mexico City, a man with cancer turns to a Mayombe priest who performs a “life exchange ceremony” involving animal sacrifice and spirits of the dead. Will the ritual stop cancer or is it just wishful thinking? In Ireland, Danny Gallagher, an incredibly rare “7th son of a 7th son” faith healer, claims to have “the cure,” the miraculous ability to channel energy and God’s power and cure disease. Does Danny’s power really work or can his healing success stories be explained by science? And on the mysterious island of Ischia in Italy, thousands of faithful flock to see two ordinary women who claim to see visions and receive prophecies from the Virgin Mary. Do they really have the power of second sight or is their popularity just a fad?