After the sudden death of Amaris Jensen's father and the mysterious disappearance of her mother, Amaris is sent to live with her cousin who can only be described as the perfect stranger. She's introduced to Sandon Davis, and learns about his practice as a self-defense trainer for seven girls. But Amaris soon finds that there weren't always seven to begin with. Where once there were ten girls, now only the seven remain under Sandon's coaching. Immediately, the trainees adopt Amaris into their group. The closer they become, the more danger Amaris finds herself in. While dealing with the heavy stress of her father's death, she notices that every girl, as well as Sandon himself, wear a strange precious stone around their neck. As Sandon gains her trust, Amaris continues to feel that he is hiding something—something that will lead to her undoing.