Progressive help · no full solution
Understudy: spoiler-light hints
Open these in order. Each hint narrows the evidence chain without naming the culprit or the final answer.
- Hint 1
Reveal hint 1
A credential identifies what opened a door, not necessarily who held it.
- Hint 2
Reveal hint 2
Compare the serial number of the working relay with the one installed before blackout.
- Hint 3
Reveal hint 3
Find who gains if the performance is cancelled, not merely who gains the role.