Jessie Myers is facing an uphill struggle.

With her husband consumed by his duties as the town sheriff and her son away at college, she spends a great deal of time alone in her New England village house. When a debilitating leg injury takes Jessie away from her nursing career, she is determined to do whatever it takes to get back on her feet again, in every sense. Despite the concerns of the people close to her, she commits to a rigorous exercise regimen along the beaches and cliffs of her Maine home.

One day, she makes an unexpected discovery while on a hike. Drawn to a small...