The International Detective Agency

The International Detective Agency is a detective agency originally run by a Theodore Blunt. Blunt had apparently used his agency as a "letter box" to which foreign agents would sent mail. After Blunt is arrested, British intelligence suspected that his contacts might continue to use the agency as a channel for communication. Tommy's secret service boss Mr Carter suggests that Tommy and Tuppence Beresford take over the agency, posing as Mr Blunt and his secretary Miss Robinson. In this way, they can continue to monitor for mail which Blunt's contacts might send. In the meantime, Tommy and Tuppence would be welcome to take any regular cases which might come to the agency. Tommy and Tuppence's exploits with the agency are documented in Partners in Crime.

The agency premises are at 118 Haleham Street, W.C. in Bloomsbury. There is a small outer office for the office boy, and two larger rooms, one marked "Private" and the other marked "Clerks".