Samantha is thirty, and she works as an undercover agent. Thanks to the “Mask” serum, she can change her appearance: alter the color of her hair and eyes, and even her age. She has about ten successful missions under her belt, a solid bank balance, but almost no close friends. One day Samantha receives an unusual assignment: to keep an eye on a seventeen-year-old schoolboy while his parents are in Europe. But during the transformation, something goes wrong, and she turns into a seventeen-year-old version of herself. High school is not the most pleasant stage of Samantha’s life, and with her return to it, her teenage anxieties come back to life. Still, it may become for her an opportunity to sort out her own feelings and understand herself.