I have personally assisted visiting priests from Europe who would assume duties while our pastor was on a retreat or vacation. My purpose was to provide them with a sense of timing, emphasis, and pronunciation, when reading from the prepared text. At my suggestion, we would at times alter the reading, as it was written with an obvious anti-male or pro-feminist slant. The American-Marxist-Socialist influence in American Roman Catholic Churches is seen everywhere, and Rome is either to weak to challenge it, or actually supports the disintegration of The Church in America.
Prepared sermons sold in most Christian bookstores are directed to the English (as in St. James) interpretation of the Bible. Presumably, the intent is to provide a speaker with a theme from which he can further expound upon. In our case, elaboration could not be a consideration, as the guest priest was not sufficiently versed in English for that possibility. We've been recently blessed with a new pastor. He is somewhat versed in English, and is attempting to deliver the prepared homily in a fashion that might lead one to believe the words are his own. There is always hope for a brighter tomorrow.
Sunday Sermons of the Great Fathers
Probably not the book to which you were referring, but I think it has much useful material.