Blood Stalkers (1976, Robert W Morgan)
Two couples visit a familal hideaway in rural US. Sound familiar?
From the get go, they are given short shrift everywhere they turn, but soldier on to make the best of things when they eventually find the bloody place
The rather faded print leaves some of the night time scenes more akin to a guessing game, but I soldiered on trying to see where this grim wee flick was going. Would make a great double bill with
The Money Pit 