The plot is based on ancient Celtic myths about changelings. Changeling, according to legend, is a creature that evil leaves to parents in place of stolen human children.
The heroine of the book is a girl. Patriciya (Tris). She has a mother, a father, and a sister—Penelopa. An ideal family, an ideal house… Everything seems fine—until one day Tris wakes up and feels that she isn’t “herself.” Her head feels full of cotton, she constantly wants to eat, her sister looks at her with hatred and calls her “not real,” and dolls and mannequins talk to her… Her parents try to explain the oddities as ordinary fever. But Tris understands it’s not that simple. Has she gone mad? Or is she truly not real?
One day she overhears a conversation, from which she learns that the “real” Patriciya was kidnapped, and she is only a changeling doll made of twigs, leaves, and the stolen Tris’s diaries. Changeling can live only 7 days—so what happens next? Death?
Tris needs to find out, in order to survive.
Mysticism, fantasy, thriller, detective—yes, all of that is in the book. But there’s also an ordinary family with problems familiar to everyone; there are sisters fighting for their parents’ attention; there is a mother and a father who refuse to understand their children and think the main thing is not to let their daughters go anywhere. There are troubles and sorrows familiar to all and every one.