Each crew thought she was with the other

The radio thought she was with the singer. The singer's crew thought she was from the radio. Between the two certainties, nobody asked her anything. Four people and one microphone: one person per row, one per column. Whoever is left alone with it in the same room is the one you're looking for.

Suspects

• Amanda, the production assistant: She has a radio pass, a singer's pass and a third pass nobody knows the origin of.
• Basílio, the lighting technician: He controls the stage lights. When the woman walked on, he pointed the spotlight at her out of reflex.
• Carmen, the singer's hairdresser: She does the singer's hair before every concert and hears everything said backstage.
• Delfim, the stairs security guard: He guards the stage stairs. He let the woman through because she walked 'with great confidence'.