The scenario:

About 30 years ago, a group of archeologists discovered excerpts of texts written by people who had witnessed the Crusades, buried inside the tomb of a scholar who died in the late 13th century. The archaeologists hired Bernard, an archivist at the Museum of the Middle Ages, to analyze the texts and determine just exactly what these documents were and who wrote them. Unfortunately, before Bernard had finished his task, aliens had abducted Bernard and the team of archeologists who discovered the documents. No one heard from any of these people again, and the discovery was forgotten until today, when these documents, along with Bernard’s rudimentary notes, mysteriously turned up at your school.