Serbia / Anica Reljić, an ex-police inspector now working in a call centre, is contacted by Sonja Tošić, a wealthy, single mother who wants to know the identity of a person who is making threatening phone calls to her. While she investigates the calls, Anica discovers that they are linked to a crime group known to her from her former life. She tries to warn Sonja, but Sonja goes missing. This prompts Anica and Tijana, Sonja’s rebellious daughter, to start searching for her. Soon, they discover Sonja might be the key to the truth about an environmental scandal that is shaking the country – a mysterious poisoning of three young boys.