Cock-a-Doodle Deux Deux The largest diamond in the world, the Plymouth Rock, has been stolen from Madame Marquise de Poule Bon (voiced by Helen Gerald) at her chateau and the Inspector is assigned to solve the case. After finding that Madame de Poule Bon was a chicken plucker in her past, he investigates the chateau, only to find out that Madame's servants are all chickens and he must deduce which one could have pulled off the theft.