Lydia and Elisa, twin sisters, identical in appearance, different in every other way.
Lydia has her life in order and opinions on everything, from her husband's business to her sister's friends, to her fellow teachers. If only those around her could live up to her high standards. But when a student, Bilal, pulls a knife on Lydia her perfect life begins to unravel. She turns to her sister. But Elisa is powerless to protect her from what follows: an anonymous letter, her car vandalised, someone watching her house. How far will Bilal go? Or is someone else the real threat? And what part does Elisa play in all of this? Twins are close ... aren't they?