: Set in the aftermath of the Morisco rebellion, the story centers on the discovery of the "Lead Books of Sacromonte," which purported to be early Christian texts written in Arabic.

Fernando Martínez Laínez is a renowned author of spy novels and historical non-fiction, often focusing on the Spanish Golden Age and the Tercios . His work is noted for its meticulous research, often cited in academic bibliographies on Spanish historiography and the Morisco era.

: The books were initially hailed as a bridge between Christianity and Islam, but they were eventually declared apocryphal (forgeries) by the Holy See.