Wealthy Frenchman Niven is called back to the family chateau when the vineyard starts failing. Unfortunately for him, the cure for ailing grapes lies in an ancient ritual.

Interesting but unsuccesful horror film that serves as an interesting precursor to The Wicker Man. Has some remarkable moments, and a intriguing performance from Tate, but it devolves in the second half into routine. A troubled production is largely to blame--initial star Kim Novak was replaced after an accident and initial director Michael Anderson dropped out due to illness, necessitating a reshoot of nearly the entire film. Still worthy of its minor cult, and not solely to the unfortunate fate of Tate.