Ron Tesoriero, Reason to Believe, (Amazon.com American link - I can't find it in Canada).

Ricardo Castanon Gomez, who headed up the investigation, explained the miracle here.

It came to my attention after giving this homily that many people have never heard of Eucharistic miracles. If you want to learn more, you can Google the topic, or read a good book on them, like this one by Joan Cruz, Eucharistic Miracles (Amazon.ca link).