9-year-old Mille has Rett syndrome. A rare, congenital developmental brain disorder that cannot be cured. In the documentary 'Mille's Secret World' we follow Mille and her mother Susanne Byrialsen, for whom her daughter's diagnosis has turned everything upside down.

Pioneering work on Rett syndrome:
In 2020, The Brain Prize was awarded to Professor Huda Zoghbi and Sir Adrian Bird for their fundamental and pioneering work on mapping the genetics of Rett syndrome, establishing the importance of epigenetic regulation in both brain development and the maintenance of normal adult brain function, whilst also pointing to novel opportunities for treatment of this and other neurodevelopmental disorders.