Harold Plummer was the husband of Evelyn Plummer and father of Cassandra.
Harold and Evelyn tried to help their daughter when she turned to drugs at fifteen years old, but without success. When Harold found condoms and £100 in Cassie's bag and realised she was on the game, he accused her of bringing shame on the family and made sure that Evelyn didn't find out.
Harold suffered a fatal brain haemorrhage not long afterwards, and, blaming his death on the stress she had caused for him, Cassie fled on the morning after his funeral. Six months later, in December 1982, Evelyn located Cassie and found that she had given birth to a son. Evelyn abandoned the child on the doorstep of a police station as she didn't believe that her daughter was capable of looking after him.
In 2024, when Evelyn learned of Cassie's sex work, she assuaged her guilt over Harold's death by attributing it to him having high blood pressure and red meat every day.