In 1562 Franciscans at Maní in Yucatán found offerings and carved images in a cave, and Landa, then provincial of the order, opened an inquiry into idolatry among Maya who had already been baptised. It ran for three months without royal or episcopal authority. Suspects were hoisted on the rope and had water forced into them. The surviving depositions describe thousands questioned, well over a hundred dead under or after interrogation, and many left crippled. It ended with an auto de fe on 12 July at which images, altars and hieroglyphic manuscripts were burned. Landa's own text says twenty seven books went into the fire and records that the Maya present wept.
Bishop Francisco de Toral, arriving to find what had been done in his diocese, stopped the proceedings and reported them, and Landa returned to Spain to answer before the Council of the Indies. He was acquitted in 1569 and came back to Yucatán as its bishop in 1573. Four Maya hieroglyphic books survive anywhere in the world today. How large the corpus had been before 1562 is not recoverable, and Maní was not the only burning, but it is the one whose perpetrator wrote it down. The three codices with European provenance, at Dresden, Madrid and Paris, all left Yucatán in the sixteenth century. The fourth surfaced from a cave in Chiapas in the 1960s and was disputed for fifty years before Mexican authentication settled it.