It Takes a Thief - Season 1 Episode 10 -

An agent has been captured and imprisoned and Al must recover a copy of the Miloslav document hidden in his hollow tooth. Al gets to the agent in prison only to find out that he hid the microfilm in Madame Marku's ring. Al must go back to Washington and break into an embassy to get the ring, so he enlists the aid of ""special"" partner, a carrier pigeon, to finish the job.