Seasons of Reckoning — Deborah Kinnard

Marcus Richards, PhD, has a perfect life: full-time as a history professor, part-time as a medieval history re-enactor. But when his former student, Bethany, vanishes, she leaves her mother an enigmatic letter, written in modern English on a scrap of fourteenth-century parchment. "Find my daughter " her mother begs. Marc knows time travel isn't possible. But when he goes to England, he gives a mysterious time-portal a try.

Landed to his surprise in Cornwall in 1356, he faces all the dangers of a world unlike the comfortable realm in his history books. Marc is soon caught up in the ways of knightly service, land management, and a murder investigation. Above all, he meets the woman of his dreams -- who will change the course of his life forever.