The series follows the Barnett family, who initially adopted what they assumed to be a 6-year-old Ukrainian orphan with spondyloepiphyseal dysplasia, a rare bone growth disorder.

Viewers are in for a ride when "The Curious Case of Natalia Grace: The Final Chapter" returns for its third and final season in January. The Investigation Discovery series follows Natalia Grace, a Ukrainian orphan with a rare dwarfism condition, as she "is forced to navigate a number of seemingly insurmountable challenges," per a press release.

“ The Curious Case of Natalia Grace: The Final Chapter ” premieres Monday, Jan. 6, at 9 p.m. ET on Investigation Discovery. Watch the new season for free with a trial from Philo.

In the final episodes of the ID series, Natalia's continued communication with her prior adoptive family wreaks havoc on the DePaul household as they try to help her understand how she's been exploited.