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On March 26, 2018, a tourist spots a flipped-over GMC Yukon XL at the bottom of a cliff in Mendocino County, California. The car belongs to Jennifer and Sarah Hart, two white moms who have adopted six black children. Six passengers are dead at the scene; two have yet it to be found.

RELATED: Two White Moms. Six Black Kids. One Unthinkable Tragedy. A Look Inside the ‘Perfect’ Hart Family

In the weeks after the horrific accident, upsetting details begin to emerge about the crash—and about the Hart family themselves. None of the victims in the car as wearing a seatbelt. Jennifer Hart, the suspected driver, had an elevated blood alcohol level. Sarah and two of the children had an ingredient commonly found in Benadryl in their system. The speedometer was stuck at 90 MPH. Welfare checks had been requested on the Hart children by various individuals who knew them.

Something wasn't right.

In pictures Jen Hart posted to her Facebook page, the family appears to have been happy and healthy, but postmortem accounts of the Hart Tribe, as many called them, paint a very different picture.

Who were the Harts? What happened that day in March? And why? All that, and more, in season one of Broken Harts, out now.