Just Before Dawn (1981) plot summary
A party of five journey into the mountainous wilderness to examine some property they have bought, unaware that a savage, disturbing murder of a local hunter has occured only hours before. No sooner have they set up camp then they fall prey too two lethal demented local brothers, who's twisted sense of 'fun' is matched only by their despising for intrusive outsiders. With a sinister giggle like Muttly (as in Dastardly and Muttly from WACKY RACES!) and a set of rusted but still razor sharp blades this pair sets out to ensure none of them make it off the mountain...alive...or intact
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