November, 1974. Aurel is a neutral lake city of banks, opera and glass arcades, and this week it's hosting the first real peace talks in a decade. Every spy on both sides of the line is in town. In Aurel, they say, every window is watched.
You arrive on the night train under a borrowed name. A Directorate cryptographer, codename NIGHTINGALE, wants to defect, and she's carrying the name of a mole inside your own station.
1. MEET NIGHTINGALE.
2. BRING HER ACROSS THE GLASS BRIDGE.
3. TRUST NO ONE INSIDE THE STATION.
The bridge opens for one hour at dawn when the summit closes. You have three days. Somebody already knows your face.