Gilbert Hastings is a lawyer working in New Zealand. As a final year student he was given the task of working with Lucille Dellow to renovate the Old Stone House in Arbor Valley. The owner of the Old Stone House, Elsie Leggat has moved into a rest home and has been persuaded to sell her house by a corrupt Nadine Norton. A hidden killer seeks revenge against Lucille's father, placing both Glbert and Lucille in danger.