Amuck! (1972)

When a stunning American woman seeks answers about her missing lover, a former secretary to her employers, she cleverly gains access to the home of a novelist and his wife. As her investigation unfolds, she becomes ensnared in their twisted desires and soon realizes that she is at the center of a dangerous murder scheme. Caught between seduction and peril, her quest for truth takes unexpected and dark turns as she navigates the couple's increasingly obsessive behavior.