The Gateway is a six-part series about Teal Swan, a new brand of spiritual guru, who draws in followers with her hypnotic self-help YouTube videos aimed at people who are struggling with depression and suicidal thoughts. Some followers move to Teal’s healing center, a spiritual startup where they produce content and manage social media accounts. Teal insists her therapy saves lives, but her critics say Teal’s death-focused dogma is dangerous. Gizmodo reporter Jennings Brown traveled to rural Utah and to the forests of Costa Rica, with extensive access to Teal and her inner circle, to...