In 2006, religion writer Donal Foley published his book, Understanding Medjugorje; Heavenly Visions or Religious Illusion?. Since then, it’s been the leading critical book on this subject in the English language, praised by experts in the field of Mariology, and in the past five years, nobody on the pro-apparition side has been able to find any substantial faults with it. And with reason: it’s well-researched, prudent in its conclusions, and focuses on critical source materials generally neglected