Listening in

In a van parked outside the café, two inspectors spend the day listening to conversations about football. They already know every team's tactics. Some clues in this case come as riddles. Four people and one whistle: 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

• Abílio, the wiretap inspector: He listens to football conversations eight hours a day. He can't watch a match any more without thinking of fruit.
• Bernardete, the café owner: She serves coffee with milk to everyone. Now she always asks 'milk from where?'.
• Cassiano, the suspicious club director: He speaks on the phone in code. The code is so good not even he understands it.
• Dolores, the neighbour at the window: She doesn't need wiretaps. She has a window.