Convinced of her daughter's innocence, Lena conducts her own research and is subject to strange visions. Meanwhile, Marta recruits a team of miners to carry out a blasting operation in the abandoned tunnels beneath the city. The police suspect that the children's kidnapper is Luca, a Roma man who is Rafal's secret lover. Rafal disbelieves this and follows the money trail. He discovers that a German paid Ada to search for a mysterious Nazi treasure in one of the tunnels involved in Marta's blasting operation...

Lena discovers that the key Sznirel gave her is to a house that belonged to a nurse named Ilse. At the entrance to the house, she comes across a box containing a bandana with the symbol of the Vril, a secret society dating back to the time when the Nazis were conducting experiments. Rafal, shocked by the death of his lover's father, killed by the police, accuses Maria of hiding dark secrets under the guise of philanthropy. The police continue to search the underground tunnels and approach very close to where Ada and the children are, without hearing the teenager's screams...