Back in 2010 Michael Barnett and his wife Kristine adopted a six-year-old orphan from Ukraine - but their happy family was soon shaken upside down.
The couple believed that Natalia had a rare bone growth disorder when they adopted her, but in a new docuseries airing on Investigation Discovery - The Curious Case of Natalia Grace - the story becomes more sinister than you could ever imagine.
A six-part documentary begins tonight and will air across three consecutive nights as the adoptive parents put forward their claims that the orphan they adopted was not a child at all but an adult who abused them and even tried to kill her adoptive mother.
