A trained peregrine falcon that the young detectives receive as a gift involves them in an exciting mystery. Imagine their astonishment when the swift-flying falcon brings down a homing pigeon carrying two precious rubies! Startling events that ensue indicate the gems are part of a ransom that has been paid for the release of the kidnapped student from India, who had come to the United States to complete his education. But Tava Nayyar, the son of a wealthy industrialist, is still being held captive. Hoping to find the clue to Tava's whereabouts, the Hardys try to track down the owner of the ruby-bearing pigeon. Their every move, however, is thwarted by the dangerous criminals not only involved in the kidnapping, but also in the large-scale smuggling of aliens from India into the United States. How Frank and Joe eventually outwit their adversaries climaxes this thrill-packed mystery adventure. - Flyleaf.