Charlie Elmore suffered a brain injury in a snowboarding accident four years ago. Now she’s going to retrace the steps of her dramatic recovery and meet other young people adjusting to life after serious brain injuries, including 19-year-old car-crash survivor Callum, avid skier Tai and fashion buyer Hannah, who has to re-learn how to walk and talk after she collapsed while out shopping and hit her head on the pavement. With their help, Charlie embarks on a courageous journey to improve understanding of this 'invisible' disability - which is the biggest cause of acquired disability in young adults in Britain - and discovers the hidden ways it affects her own life too.