The human brain is the most complicated organ in the known universe. What if there were a deep place inside it that could take you from pain to pleasure? Hunting for Hedonia begins its journey in the 1950s, when Dr. Robert Galbraith Heath, the controversial neurologist, psychiatrist and psychoanalyst at Tulane University, first implanted electrodes inside the human brain. Thus began the practice of Deep Brain Stimulation (DBS). Initially used to cure schizophrenia, DBS was later expanded to treat depression, chronic pain, epilepsy and other conditions before the practice fell out of favour for ethical and political reasons. Renewed work with DBS in the 1990s to successfully treat Parkinson's disease has reignited interest in the practice and its potential to also treat OCD, addiction, PTSD and other debilitating disorders. Pernille Rose Grønkjær's fascinating new film consults history, patients and medical professionals to better understand what the future holds for the human brain.