The son of a rich man was kidnapped. The kidnapper wanted the rich man to bring and put the expensive diamond into the call-box located in a city park. Policemen surrounded this park, intending to catch the criminal. The father of the kidnapped child came to the call-box and did everything the kidnapper said to him, but the police could not prevent the cunning criminal from taking the diamond out of the call-box. They didn't grab the villian as well. What did he do?
This is a real history that happened in Taiwan. When the father came to the call-box, he found a postal pigeon in the cage. There was a note attached to him, in which it was said that the diamond should be put into a small pouch attached to the neck of the pigeon, and then he should let the pigeon out of the cage. When the rich man did this, the dove flew through the city to its dovecote, and the police could not follow it.