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...

Two of the missing children are intercepted by Marta, who takes them to a room within her Black Daisies sanatorium. Lena manages to sneak into the facility's secret wing, where she discovers information about Nazi experiments during World War II, including those conducted by a mad scientist who wanted to create a new race of human beings using the women of Walbrzych as guinea pigs. She also discovers that Ilse was her grandmother...