'On the edge' is a TV drama about three young women who find themselves in the Middle East in the den of terrorists. Based on real events, the series depicts how innocent people are recruited and become living weapons in the hands of militants. A student of a prestigious Moscow university, Lena grew up in a happy well-to-do family. One day she learns about her fiancé's infidelity and then that her own father has a mistress as well. Deeply shocked by this double betrayal, Lena becomes an easy prey for the recruiter Ruslan. A young man quickly conquers her heart. To marry him she converts to Islam and goes to his homeland, while her father desperately rushes to look for his daughter. The traces lead him to the Caliphate - A provincial beauty Katya also falls under influence of Ruslan, whom she met online. The persistent suitor convinces the girl to come visit him in Turkey. Katya packs her belongings and goes to Istanbul, where not a prince charming is awaiting for her. While both Katya and Lena were tricked into coming to the Middle East, Amina goes there of her own will. As a widow of a militant with a little son, she was constantly harassed by her fellow villagers and finally decided to leave for Syria, where her beloved husband died. Now in Syria, in the territory of the Caliphate, all these heroines are prisoners of militants and each of them has her own mission to complete. Having met by accidence, the women decide to escape. For the sake of a chance to return to their own country, they will risk their lives with weapons in their hands.