Sometime in the future, a group of students is studying an archaeological site in France when the professor in charge disappears. While uncovering 600-year-old documents from the remains of a monastery, they discover a note dated April 7, 1357, and written in the professor’s hand that says “Help me.” Three people then embark on a journey back in time to rescue the professor. The rest of the story is a heart-pounding adventure in 14th-century France.
'Timeline' by Michael Crichton: A Yale history professor travels back in time to 15th century France and gets stuck, unable to return to the present. His colleagues organize a rescue and on landing in France become involved in the Hundred Years War.