S12, E12: The team find a woman named Bethany dead in a hotel room having booked in with Rachel's credit card. Nikki performs the post mortem against the wishes of a government minister and is soon arrested, leading to a shocking discovery inside the prison. Meanwhile, Leo has been pursuing Rachel's research. She talks about one woman, Cossie, in particular. Nikki visits the village, where she discovers Cossie had been ill and her husband killed her for seeking help from Rachel. When Leo carries out water tests he discovers that Rachel had uncovered a uranium leak from Peter's mine.