Irena is arrested. Her stay in prison is shocking and she encounters hostility from her fellow prisoners. Karolina, convinced of her mother's innocence, conducts a private investigation.

Irena manages to gain the respect of her cellmates. Karolina and Michał try to figure out the connections between the suspects and follow the trail of the victim's money. Karolina tries to decipher her father's notebook.

Irena's fellow prisoners plan to escape, but a tragedy ruins their plans. Karolina finds it hard to bear the truth about her father and is convinced that he could not have acted alone.