Taking place seven years after the events of the second series, Catherine is coming close to retirement age, and has plans to go on a hiking expedition to the Himalayas. Catherine is called to investigate the discovery of human remains found near a reservoir, where she comes to realise the murder suspects share a history with Royce, who has since been transferred to a cell in Sheffield and is awaiting trial for a string of unseen offences. Meanwhile, Ryan, who is now 16 years old, has been keeping in touch with his father after sending him a letter at the end of series two, and has been visiting him secretly behind Catherine's back with help from Clare and her new partner Neil. When Catherine finds out, she temporarily blocks contact with the three of them and presents Ryan with an ultimatum. Ryan is also having problems at school with his PE teacher Rob Hepworth, who has kicked him off the football team following accusations of misconduct. At home, Rob is physically abusive towards his wife Joanna (Mollie Winnard), who has developed an addiction to prescription drugs and is receiving them illegally from her pharmacist Faisal Bhatti, who in turn is being blackmailed by a gang of violent dealers in exchange for the freedom of his family.
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Catherine调查Claire的部分大概是全剧的重中之重了,最后家里的对峙感觉差了点意思,处方药故事线前面悬疑感铺得那么长竟潦草收尾了这一点很遗憾