A modest physiotherapist Olga Solovyova has been divorced for a long time and is raising a teenage son. One day, a new patient appears in her office - Reserve Colonel Mikhail Zorin. He is undergoing rehabilitation after another injury. Mikhail is fascinated by Olga's beauty and draws attention to her earrings with sapphires, which suit her so well. Feelings flare up between Olga and Mikhail, they begin to live together. However, Olga's son is set against the stranger. He is sure that Mikhail is not who he claims to be and appeared in their house for a reason. Blinded by love, Olga does not believe her son. Soon someone makes an attempt on Olga's ex-husband. Suspicion falls on Mikhail. Perhaps her son is right, and she has let a dangerous criminal into her life. Olga conducts her own investigation and learns a terrible secret that the closest people hide from her.