The pool in the protected area

At a holiday home in Odemira, a swimming pool sprang up in the middle of a protected area. The planning permission is nowhere to be found. Four people and one piece of evidence: one person per row, one per column. Whoever is left alone in the evidence's room is the one you're looking for.

Suspects

• Alda, the landscape architect: She drew the pool as an 'ornamental pond' so the plans would get through the council.
• Bento, the builder: He builds for whoever pays and whoever's in charge. Sometimes they're the same person.
• Cidália, the neighbour: She's lived next door for thirty years and has complained about everything. Not about this, because she wants a pool too.
• Duarte, the council inspector: He went to inspect the works three times. All three times it was raining and he didn't get out of the car.