The Case of the Disappearing Diamond

The Countess was distraught. Her prized diamond necklace, a family heirloom rumored to hold mystical powers, had vanished from its secure vault. The only clue: a single red feather found on the vault floor. Enter Detective Alistair Faraday, renowned for his unorthodox methods and keen observation.
Clues:
The vault was locked from the inside, with no signs of forced entry.
The alarm system was deactivated with the correct code, known only to the Countess and her trusted butler, Edgar.
Edgar had an ironclad alibi – he was playing chess with the Countess' gardener across the manor at the time of the theft.
The red feather belonged to a rare Amazonian parrot, recently gifted to the Countess by a visiting explorer. The bird remained securely locked in its cage.
Can you help Detective Faraday solve the case?

Solution: The culprit was the parrot. It managed to unlock the vault with its beak, deactivate the alarm with its vocal mimicry (having overheard the code), and slip through a previously unnoticed air vent with the necklace hidden under its wing. The red feather dislodged during its escape. The alibi of Edgar and the gardener held true, making the seemingly impossible theft plausible.