The Hooded Hawk Mystery (en Inglés) - Franklin W. Dixon

When a crate containing a peregrine falcon arrives at the Hardy home without explanation, Frank and Joe are thrust into a high-stakes adventure. The bird is soon targeted by a thief, and its first flight brings down a carrier pigeon bearing valuable rubies instead of a message. These strange events lead the teenage detectives to a sinister smuggling ring operating along the coast, where illegal aliens and precious gems are being moved in secret.

Working with an emissary from India, the brothers discover that a young prince has been kidnapped and is being held for ransom. The criminals are using carrier pigeons to coordinate their operations, and the Hardys must train their new falcon to intercept these airborne communications. As the trail leads to a remote hunting lodge and a dangerous island hideout, the boys face threats from bombs, electrified fences, and poisonous snakes.

To rescue the captive nobleman and break the ring, Frank and Joe must infiltrate the gang’s mountain fortress. With time running out and their enemies closing in, the young sleuths rely on their wits and their winged ally to stop a ruthless conspiracy.