From Wikipedia:
"Acoustic Kitty was a CIA project launched by the Central Intelligence Agency Directorate of Science & Technology, which in the 1960s intended to use cats to spy on the Kremlin and Soviet embassies. In an hour-long procedure a veterinary surgeon implanted a microphone in the cat's ear canal, a small radio transmitter at the base of its skull and a thin wire into its fur. This would allow the cat to innocuously record and transmit sound from its surroundings.
The first Acoustic Kitty mission was to eavesdrop on two men in a park outside the Soviet compound on Wisconsin Avenue in Washington, D.C. The cat was released nearby, but was hit and allegedly killed by a taxi almost immediately. However, this was disputed in 2013 by Robert Wallace, a former Director of the CIA's Office of Technical Service, who said that the project was abandoned due to the difficulty of training the cat to behave as required, and "the equipment was taken out of the cat; the cat was re-sewn for a second time, and lived a long and happy life afterwards". Subsequent tests also failed. Shortly thereafter the project was considered a failure and declared to be a total loss.
The project was cancelled in 1967. A closing memorandum said that the CIA researchers believed that they could train cats to move short distances, but that "the environmental and security factors in using this technique in a real foreign situation force us to conclude that for our (intelligence) purposes, it would not be practical."
Inspired by real events, Project Acoustic Kitty follows the attempts of agents Cooper and Parker to train cats to spy on the Soviet Ambassador in Washington D.C.
Unable to force the felines to listen to any command, and far from being "cat persons", they ask help to Bella, a circus performer and catwhisperer.
Though the first tests fail badly, Spark, one of the trainees, shows to be prone to obey commands, so he is implanted with a radio transmitter, and the first real mission starts: he's able to access the embassy, but he eavesdrops on the chefs... After all, he's just a cat!
Back at work, Parker suggests to try spying the conventional way. They stake out the Ambassador meeting with an agent (who is later revealed working for the CIA). But it’s clear they need Spark’s help to get the intel. In the field, they almost get what they need, but Spark gets kidnapped by the Ambassador. Parker, Cooper and Bella defy orders to rescue him.
Back on the bottom of the pile, Cooper, Parker, and Bella now find themselves looking for the mole inside the Cia, and they are able to catch him only with Spark's help.
