Evelyn Yang goes public, which sets off a search for a missing letter that could change everything.

If you or someone you know is a survivor of sexual assault, here are some resources:

The Rape, Abuse & Incest National Network (RAINN) survivor helpline is 1-800-656-4673.

The National Sexual Violence Resource Center provides resources for sexual violence and prevention education. You can find them at nsvrc.org.

The National Suicide Prevention Lifeline can be reached at 988.

To read Laura Beil and Bianca Fortis' article about this story on ProPublica visit: https://www.propublica.org/article/columbia-obgyn-sexually-assaulted-patients-for-20-years

Listen to Exposed's bonus episodes exclusively and ad-free on Wondery+. Join Wondery+ in the Wondery App, Apple Podcasts or Spotify. Start your free trial by visiting wondery.com/links/exposed/ now.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.