This is the story of a man known online as Flash  a man driven to the brink of suicide by the debilitating effects of cluster headaches. After years of ineffectual treatments, Flash stumbled on what he declared was a new treatment, as controversial as it was, he claimed, effective: hallucinogenic drugs.

Flash was ridiculed by the cluster headache community for his "miracle cure". But when a survey of fellow sufferers who self-medicated with hallucinogens was published in the mainstream journal Neurology, the results gave weight to his claims. The Harvard Medical School scientists who conducted the survey have now applied for a preliminary clinical trial on the subject.