Secret Agent, AKA Danger Man

The Colonel's Daughter (1x14)

Air date: Nov 24, 1964

"In India's sunny clime," a retired colonel ekes out his pension by collecting and selling butterfly specimens. When the colonel's assistant dies mysteriously, Drake is sent to investigate, and ends up getting help from a local policeman, whose own investigation Drake pursues. Finally, both trails entwine in a complexity that makes this ep worth a second viewing.