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1. Bölüm Emma is now training as a forensic chemist - and on the cusp of seeing her mother's murder case finally solved, while Daniel has returned to Dundee to give evidence against Phil.
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2. Bölüm A second explosion puts pressure on McKinven and Sarah to find and stop the bomber. As Phil's murder trial continues, both Daniel and Emma are feeling the strain.
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3. Bölüm The task facing McKinven is more daunting than ever, especially now that his wife Azra is joining the investigation. Meanwhile, Kathy's PhD student sees more than she should...
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4. Bölüm Two suspects derail the investigation as McKinven and Sarah are consumed by their feelings. Kathy's inability to communicate becomes a serious problem.
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5. Bölüm Another deadly explosion occurs. Sarah and McKinven's growing attachment has consequences, as Kathy suspects Jean the Dean of having a secret to hide.
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6. Bölüm Sarah works with McKinven to prevent another explosion before making decisions about their future. Kathy realises change is essential, personally and professionally.