A fetus is found in a sex worker’s womb, her dead body encased in a valise washed up on shore in Sydney. Crime detective Robin Griffin (Elisabeth Moss) is on the case, and meets up with her biological daughter, the product of a gang rape when she was 16. Mary (Alice Englert), now 17, has issues with her adoptive mother Julia (Nicole Kidman), and wants to marry a dubious much older type. These mother-daughter themes swirl around the two episodes of Top of the Lake: China Girl, premiering this week on SundanceTV. Jane Campion is the show’s creator, and these two “chapters,” as she calls them, indicate this director’s ease with the long form of television series, as she told me at a Thursday’s Film Society of Lincoln Center preview. That Alice Englert is her daughter adds a layer of maternity to this series.