No cameras

The building has cameras everywhere except in one place. The break-in happened exactly there, which was either very bad luck or a very good memory. Some clues in this case come as riddles. Four people and one piece of evidence: 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

• Arnaldo, the CCTV technician: He installed cameras all over the building except in one place. Guess which.
• Basília, the social media adviser: She posted 'ground zero of democracy' before anyone had told her what happened.
• Celestino, the electrician: He came to change a bulb in the corridor. He also changed his mind about what he saw.
• Domingas, the MP on duty: She was on duty that night. She says she didn't hear anything because she was watching footage from a camera that doesn't exist.