"There were zero hesitations in continuing the story," says ID president Jason Sarlanis of the 'Final Chapter' episodes, streaming Jan. 6-7.

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 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.

“ 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 three seasons, "The Curious Case of Natalia Grace" has examined Natalia's troubling and traumatic life story, bouncing from foster homes to many different adoptive parents after coming to the U.S.

The third season of the ID channel docuseries brings to light allegations of financial and physical abuse against Natalia's new adoptive parents, Antwon and Cynthia Mans; THR reached out to the Indiana Police Department about the allegations.

The Final Chapter' Natalia expresses how she wants to leave the Mans family The first episode of The Curious Case of Natalia Grace: The Final Chapter takes viewers behind the scenes of Natalia Grace’s rocky relationship with the Mans family,