What happens when you administer psilocybin to experienced zen meditators? A neuroscientist and a zen master carry out a ground-breaking double-blind experiment on a majestic mountain in Switzerland. 

Under the supervision of psychiatrist Franz Vollenweider and Zen master Vanja Palmers a group of Zen meditators – who have never used any psychedelic substances before – are given psilocybin on the last day of a 5-day retreat. Half the group receives a placebo. 

Their goal: to examine the nature of consciousness through meditation and psilocybin. Can psilocybin create a revolution in improving mental health and strengthen our connection with our environment?