Book excerpt: In the work of documentary filmmakers, explains Nick Polizzi, one cardinal rule is never forget that your job is to document, not participate. But when Nick set out to explore the native outback of the Americas - meeting healers, shamans, and medicine women and tapping their well of ancient wisdom, nearly lost to the rest of the world - he had to bend that rule. As he found his way into highly sacred and often very private shamanic ceremonies, not participating ceased to be an option. Nick invites readers along on his journey of discovery to make indigenous knowledge of healing accessible to us all.