The Message in the Hollow Oak (Nancy Drew Mystery Stories #12) by Carolyn Keene

Writer: Mildred Wirt (1935). Revised By: Grace Grote (1972). Aunt Eloise invites Nancy to New York City to meet her detective friend for a mystery case in Illinois. Detective Boyce tells the story of a wounded French missionary in 1680. The French missionary was nursed and regained consciousness only long…