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First Refusal: When a third-party broker offers to sell the names of British agents in Eastern Europe for £100,000. Callan suspects a leak in London and races to find it before the broker's proposal expires.
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It features Edward Woodward, Russell Hunter, Patrick Mower, Anthony Valentine, and Martin Wyldeck.
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Callan is a British espionage drama thriller television series, which originally aired between 1967 and 1972. It features Edward Woodward as David Callan, an agent of a British state secret service dealing with internal security threats to the United Kingdom. Callan's section is responsible for removing those who pose a danger to the "innocent" by persuasion, blackmail, extortion, or death.