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Reporter George Cragge and Police Superintendent Frank Jefferson investigate a series of murders of London bank managers, a small political party contesting a by-election, and a plan to overthrow the Director-General of the BBC.
Part One
A serial killer has begun murdering bank managers. BBC radio crime correspondent George Cragge gets involved after fielding calls from the killer while broadcasting on Radio 4.
Part Two
After murdering an MP in the House of Commons, the killer makes a veiled threat to Cragge on air.
Part Three
The mysterious Andrew James is "fast-tracked" to an Old Bailey trial for the Bank Manager murders.