First broadcast 15th16th April 2012.br br Leo gives evidence at a custody hearing in the wake of a child's death, his opinion over-ruling that of Dr Helen Karamides, which annoys her former pupil Nikki, who sees Helen as the victim of the male establishment and cannot believe the accusation that Helen is retaining tissue samples from past cases.br br James Cosmo - Arnold Mearsbr Elliot Birch - Young Mearsbr Tom Ward - Dr. Harry Cunninghambr Emilia Fox - Dr.