Blake is taken off the case after assaulting Craig, who is also targeted by a gunman, possibly student Dessie Toner, his suspected blackmailer. After Mair's house is raided Evie uncovers his relationship with Bethan McGrellish and the secret they are sharing whilst Lauren believes the suspect seen on CCTV is actually not the killer but their first victim. Annie finds weapons possibly used by the murderer at the same time that Craig is taking his students on a tour of a hydroelectric dam. She joins Lauren as they pursue their suspect along its darkened corridors, finding other bodies on the way. Alan, returning to work, finds another corpse in the loch. Toner is the chief suspect as the killer but the dismissed Blake tells Lauren he believes he was not acting alone.
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