In the hallowed halls of Hamburg's conservatory, Mormon vocalist Greta Hoffmann maintains a flawless facade while secretly harboring forbidden compositions in her portfolio. Beneath Wagner's bombastic notes and proper German technique lies something far more dangerous—sheet music embedded with coded resistance instructions.

Just as Friedrich's network begins to accelerate their rescue operations, disaster strikes. A surprise inspection by the Reichsmusikkammer sends the conservatory into panic, with students and faculty scrambling to prove their cultural purity. When Inspector Hoffmann unexpectedly approaches Greta's piano and begins leafing through her portfolio—fingers inching dangerously close to pages that could condemn her—everything hangs in the balance.

Will Greta's perfectly composed performance be enough to save her? Or will her music finally lead to her undoing?