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It looks like all the evidence is pointing to one man: Leighton Thomas, the convicted murderer living in Lochnafoy with a new identity.

An old friend turns up after seeing him on the news and tries to get Leighton to return to his violent ways. Will Leighton reveal his true colours?

Also, teacher Craig is questioned further about Niall’s murder. Blake thinks Craig fits the profile of a serial killer – but Blake has secrets, too…