Originally posted by John G
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There is no good solid evidence which points to a particular person being the caller, we have to infer the caller from the rest of the known facts. We can say it was a man. That if Wallace was the killer then he was most likely the caller, even though he disguised his voice so Sam Beattie did not recognise it. If he wasn't the murderer then it was Parry pranking or the would be thief/murderer. How you determine the latter is through the other evidence.
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