Third Girl – series 11, episode 3. First aired in September 2008.
Norma Restarick seeks help from Poirot, believing she may have committed murder. When she sees him in person, she flees, saying he is too old. He pursues the case finding that Ariadne Oliver sent Norma to him. He believes there is a murder that prompted Norma’s fears.
James plays Andrew Restarick, Norma’s father who abandoned her and her mother Grace when Norma was about 5 years old. Andrew had run off with a woman in a relationship that ended soon after. He travelled in Africa in financially successful ventures. Norma lived with her mother until Grace’s death two and a half years before. Andrew returned to England after his brother Simon died a year earlier, to work in the family firm, arriving with a new young wife, Mary.
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Source – synopsis taken from wikipedia