(001) Die drei ???: The Mystery of the Stuttering Parrot (American English)

Jupiter, Pete and Bob discover that a mysterious Englishman has died, leaving seven parrots. All of them can talk – one even stutters – and all have been trained to utter cryptic messages. A sinister man is so desperate to get hold of the parrots that he is threatening everyone who stands in his way.
What was the Englishman trying to say through his birds? Why does the sinister man want them? The Three Investigators are determined to find out – before somebody gets hurt!