Episode 1: Early one morning in Brighton, Harriet Penny is puttering around the burned-out West Pier while her husband, Sam, fishes. To her horror, she witnesses a man dumping a girl's body into the water, before becoming the killer's next victim herself. When Sam comes to her rescue, he is attacked but escapes-only to later be accused of killing his wife, leaving his son, Joshua, to try to clear his name.