A Ghost Story for Christmas (1971)

S1E8 The Ice House

At a secluded health spa, Paul (John Stride) arrives seeking rest, only to find the staff unsettlingly frigid to the touch. The brother-and-sister owners exude an eerie, unnatural aura, as do the other residents, all of whom seem bound by a strange, silent connection. As Paul investigates, he discovers their chilling secret revolves around two peculiar vines, which appear to hold a mysterious, life-draining power over everyone within the spa's walls.