Special Branch of Scotland Yard

Special Branch of Scotland Yard’s role in the hunt for the assassin threatening Charles de Gaulle shows how a police unit could turn routine records and carefully compartmentalized work into an urgent cross-border investigation. Led by Bryn Thomas, the branch first searched for a killer whose name it did not know, then rapidly assembled a task force when Charles Calthrop emerged as a specific lead.

Mandate and Secrecy

At first, Thomas gave two detective inspectors a deliberately narrow assignment: find a professional political killer in the branch’s archives and records, but do not tell them why. The French police suspected that the man might be targeting Charles de Gaulle, yet Thomas kept that suspicion outside the search. The separation was purposeful: Special Branch could investigate a potential assassin without spreading the secret or allowing the French inquiry’s full purpose to become known within the team.

The work began amid a crowded field of records. The inspectors checked files on political troublemaking, convictions, and even suspicions, although Thomas expected the list of plausible professional operators to be short. He and the two inspectors cleared outstanding paperwork from their desks before settling into the archive search. In this early phase, the branch’s task was less to pursue a known suspect than to make a usable identity emerge from records that offered no name to start with.

Building the Calthrop Inquiry

The operation expanded sharply after the British Prime Minister authorized Thomas to proceed with enquiries into Charles Calthrop. Thomas gathered six of the Special Branch’s best detective inspectors. One was recalled from leave; two were taken away from other assignments, including the surveillance of a man suspected of passing classified information to an East European military attaché. Two had already helped search the archives, while another was called in from his day off, where he had been gardening in a greenhouse.

Thomas briefed the six at length, swore them to silence, and managed a continuous flow of telephone calls. At just after six in the evening, the Inland Revenue located Calthrop’s tax returns. One detective went to retrieve the file; the rest worked the telephones, while another was sent to Calthrop’s address to question neighbours and local tradesmen about where he might be. Photographs made from the image Calthrop had submitted with his passport application four years earlier were printed in the photographic laboratory, and each inspector carried one.

Following the Documentary Trail

Calthrop’s tax record gave the investigation a history to pursue: he had been unemployed for the past year and abroad for the year before that. For most of the 1960–61 financial year, however, he had worked for a leading British manufacturer and exporter of small arms. Thomas recognized the firm’s name, identified its managing director, Patrick Monson, and arranged to see him at his country house near Virginia Water.

Monson confirmed that Calthrop had worked for the company for just under a year. The crucial detail was the nature of a previous assignment: in December 1960 and January 1961, the firm had sent him to Ciudad Trujillo to try to sell British Army surplus submachine guns to Trujillo’s police chief. The inquiry thus joined apparently ordinary employment and tax records to Calthrop’s experience with weapons and an overseas posting. The records did not, by themselves, prove that he was the assassin; they gave Thomas a concrete lead to test.

Scale, Method, and Significance

The branch’s part in the hunt was defined by concentrated personnel, controlled disclosure, and the conversion of administrative traces into investigative leads. It moved from a name-less search through political and criminal files to a focused examination of Calthrop’s address, tax history, passport photograph, and arms-industry employment. The task force’s composition also shows the practical cost of urgency: investigators were diverted from other duties, recalled from leave, or summoned away from their own time.

Special Branch of Scotland Yard did not solve the threat by relying on a single clue or a solitary detective’s intuition. Its contribution lay in assembling records and people quickly enough for Thomas to follow a trail from an old passport photograph and tax file to a former employer and a specific weapons-sales mission. In the novel’s procedural account of the manhunt, that investigative groundwork makes the institutions and their ordinary paperwork part of the contest against an assassin who depends on concealment.