Nathan's Kingdom is a dark fantasy, coming-of-age drama about Nathan, a 25-year-old autistic man struggling with his teenage prescription-addict sister, and rather than surrendering their lives to social services, they risk it all to find a kingdom that once existed only in their imaginations.

When Harry Poole tries out a new medication for Bipolar Disorder, he is reborn as "Edward Grey", a seductive but dangerous alter ego who dramatically takes over his life, changing the young man and those around him forever.