- One last time, head back to the Riverside Manor.
- Head down into the basement and go to the Cryptos Terminal.
- In the Terminal, access [Log In: Headmistress Shannon Rivers].
- Once there, go into: [Administrative Actions], [Authorize Promotion], [Authorize Promotion - Mistress of Mystery],[$UNKNOWN_USER].
- Return to the log in screen after that.
- Access your account as [$UNKNOWN_USER] to claim your promotion, get the final holotape to complete the mission.