A Court of Mist and Fury · Chapter 69
Feyre Becomes High Lady of the Night Court
After returning to the Spring Court with Tamlin, Feyre reveals to the reader that she is now the High Lady of the Night Court and acting as a spy within Tamlin's court to bring down Hybern from within.
Outcome
Feyre begins her double-agent role, concealing her true allegiance while pretending to be grateful to Tamlin.