In June 1994 Dr Leah Parata disappears on her way to the mountains after talking to her neighbour Emily. No trace of her is ever found. Fast forward to Feburary 2019 and Leah's mother phones Emily to tell her that her father has Alzheimers. Emily flies back to New Zealand from London to find that it is indeed the case. In a lucid moment Felix entrusts Emily with an envelope to be opened on his death. Can it have anything to do with Leah's disappearance.