A Time for Grace by Laura Billingham
After a turbulent few years, Grace pays a visit to her one remaining blood relative, her elderly uncle. Whilst there she discovers an ancient wooden chest and is catapulted 800 years back in time to Medieval France. She finds love but the danger of war looms. Can she return to her own time and what is the link between herself, her alter ego in the past and the handsome man she is compelled to marry?