
Stage 1
Where Doubt Begins
Four days in the safe house were long and quiet. Outside the window Neo City's neon ran down like rain, and watching it I kept thinking about how we are always one step late. The door opened and Phantom himself walked in. I had never seen him move in person. "Zero, we have a problem." His voice was low. "OmniCorp reads our movements too precisely. That isn't chance. There's a spy inside." He set a USB stick on the table. Activity logs for every member, he said. My fingertips went cold. Suspecting your own is far heavier work than hacking an enemy. "Work out the decryption key yourself. The rule for building it is written inside."
Clue
[USB note / decrypt.key] "Key = ShadowNet member count (7) multiplied by your first mission code (103). Take that value and append the single-digit remainder when it is divided by 3."