The Vow

Mark Vicente and Sarah Edmondson, former high-ranking NXIVM leaders, describe the dream and mission of NXIVM. Bonnie Piesse, Mark's wife, tells him she's worried about the organization and Keith Raniere -- NXIVM's leader and Mark's mentor.

Bonnie leaves NXIVM to make sense of it all and tries to convince Mark that something's amiss.

Sarah confides in Mark about DOS, a secret women's group. They lament their roles as recruiters and question what to do next.

The former members strategize with Catherine Oxenberg about how to get her daughter out of DOS.

Unable to get the attention of the authorities, Catherine and the former members go to the New York Times. While weighing the pros and cons of going on record, Mark reflects on his time at NXIVM.

When they see no action by the authorities, the team contacts additional media outlets. Barbara, an early defector, shares her insight.

Catherine meets with Frank Parlato to build a dossier of evidence for the New York Attorney General's office. Toni Natalie, Keith's former girlfriend, recalls her experiences and the challenges she faced with Keith dating back to the '90s.

As the group gathers evidence for their FBI testimonies, they express their beliefs about how the curriculums of SOP and JNESS, men's and women's groups within NXIVM, reshaped their ideas on gender roles and may have laid the foundation for DOS.

Finale. Keith leaves the U.S. and is spotted in Mexico. Later, the team faces a shocking development in the case.