Claire spent many years searching for her younger sister Alice - after breaking up with her mother, her father deceived her and took her to another country. And then the long-awaited letter arrives to her: Alice is going to return home to England. However, very soon Claire’s happiness gives way to unaccountable anxiety. Why is Alice acting so strange? She copies her older sister's clothes and behavior, openly flirts with her husband... Or maybe Alice is trying to take her place in the family?.. But no one except Claire notices Alice's strange behavior. Then she decides to conduct her own investigation and find out the truth: who is Alice really - her sister... or an impostor?