Thanks to Jason Kottke, I came across CBC Uncover: Escaping NXIVM:

NXIVM calls itself a humanitarian community. Experts call it a cult. Uncover: Escaping NXIVM is an investigative podcast series about the group, its leader Keith Raniere and one woman’s journey to get out.

This is a great podcast and if you liked Serial, Making a Murderer, and others like it, definitely check it out. It’s available on just about every podcast platform you can think of.