Irina meets her college love after 30 years had passed.

Back in past Sergey was passionate about two things - Irina and science and by choosing later he went away for long-term expedition. Craving for revenge Irina rushed into marriage with the first suitor she met.

Now she is 50. Her first marriage failed and she understands that Sergey is her last chance of happiness.

Afraid of losing Sergey again, she tells him that her 30 years old daughter Tatiana is the result of their last meeting.

But Tatiana doesn’t accept the new father obediently and begins her own investigation.

One day, when Sergey is on the way to visit Irina again, Tatiana is attacked by serial killer in elevator. Sergey scares the criminal away though lets him flee. After that attack Tatiana could not get rid off persecution phobia - she is the only survivor of this serial killer victims. The criminal investigation of the attack is taken over by Tatiana’s ex-husband – police detective Ivan.

The research of Tatiana’s birth crosses the paths with the serial killer case. Tatiana finds out that she is not related to either Sergey or to Irina. And everything that happens to her is the long-term consequences of the events from the ancient past.