One Deadly Summer (1983)

Oozing sensuality, the seductively alluring Eliane Wieck arrives in a frilly dress carrying a small suitcase, with her demure German mother and disabled father, at a rural southern-French town. Pin-Pon, a car mechanic and volunteer firefighter, instantly falls for the charms of the mysterious newcomer, and before long they get married. However, was it love at first sight for Eliane too? What links her enigmatic presence to the family's dust-covered old mechanical piano in the barn? What drives the cryptic young woman? Is it hungry curiosity--or something far more sinister?