I believe the question is for Killer vs Inspector using a newer version of the rules. I originally got the Indines version, but am aware of the Solve action for inspectors in Noir Automata. "Name both the killer's secret identity and disguise. If you are correct, you win. Otherwise the killer wins."
In this version the killer only has the ability to swap between 2 identities drawn at the start, not endlessly change disguise from the top of the deck.