MIT arrive at Sun Hill to investigate links between the recent set of murders that have occurred in and around the borough. When they decide to throw Sam and her CID team off the case, she is quick to enlist Duncan to help her continue with her own investigation. Chandler finds himself in even deeper water when Anne Merrick is found dead after a fall. He subsequently asks Debbie to provide him with another alibi, but how far will she go to protect him? Brandon and Cathy continue their search for missing teenager Samina. First appearance of recurring character DCI Andrew Ross.

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