The attack on the abbess leads Sister Arsinoe to the conclusion that the perpetrator of the monastery's crimes is among the nuns. Meanwhile, Karaiskos and Stamatis visit Agia Theodouli monastery trying to find clues that will lead them to the nun who has the solution to the mystery. At the same time, Sofianos and Tsakalakis come upon to a new revelation that overturns the facts so far: one of the nuns of Agia Theodouli has once been accused of murder...