Pollution and the environment become issues in the Valley following Lucy's visit to the local tip. Cris is faced with a medical and personal dilemma when his sister Stephanie comes to visit. Matron Sloan is being evasive about the reason for her day off with Mary Sheridan. Terence's old flame Marianne Kubik is called back to Wandin Valley by matron Sloan when Terence hurts his back. A potential scandal surrounds the discovery of contaminated hospital waste at the tip. Matron Sloan attends a naturalization ceremony.