Salt: Or the Education of Griffith Adams (1918)

Casey Randolph was content with her quiet life. She had a great job, a circle of close friends, and stood at the threshold of inheriting millions. When one phone call brought painful secrets from the past back to haunt her, her life took a terrifying turn. Casey is an independent woman with a strong faith and a strong sense of family pride, but now she finds herself feeling, for the first time in her life, helpless, vulnerable, and alone.
Casey’s great-grandfather, archeologist Commander Frederick Randolph, had explored the African jungle in the early 1900s, searching for ancient ruins, and instead discovered a legendary mine full of vast riches. He returned to the States with a large and valuable sapphire, which became a family heirloom. It is this sapphire, the Blue Frog, which leads danger to Casey’s door and sends her searching for answers. With nowhere else to turn, she flees to the shelter of her friend Tom’s house, and discovers how friendship can inadvertently blossom into romance.