A widow with three boys to raise, Mary Graves has no time for peddlers of phony medicine. She's a dedicated healer working alongside her doctor father. When a handsome stranger blows into town with his "elixir of health" and asks questions about her newly adopted son, Mary's determined to uncover the truth behind all his claims.

Once the reckless heir to a Boston fortune, Dr. Luke Jacobs travels the country with his herbal medicine while searching for his long-lost son. After meeting the feisty doctor's daughter and her youngest boy, Luke has found what he's been looking for at last. But can he convince her to let him into her home, her family—and her heart?