The numbering is designed to suggest that the series belongs to a much longer imaginary set of cases: what was advertised as 'Being the Hundredth and One Case' was the first instalment in the series (and Macleod's second radio play).
Source: 'It Clings', Wireless Weekly, 4 October 1935, p.9.
'A big figure in the War Office has been so misguided as to enlist the aid of that genial but dumb duo, Clipper and Brown, to assist him in clearing up the mystery of a missing document, a document so tremendously important that on it may depend the peace (or the pieces) of Europe! The hollow-headed sleuths meet the charming female spy with the pronounced foreign accent and go from one breathless adventure to another in an effort to achieve greatness, only to find greatness thrust upon them—from a very unexpected quarter.'
Source: [Radio guide], Wireless Weekly, 27 December 1935, p.43.
Australia : Australian Broadcasting Commission , 1936'The dumb detectives, Clipper and Brown, accept an assignment in Egypt, to guard a mummy during transportation from the Valley of the Kings to a foreign destination. Their employer, one Zapara, has heavily insured the mummy, and schemes to get it both ways. Clipper and Brown arrive hard, on a soft spot by aeroplane. Their first impressions of Egypt are obtained in a harem, which they are persuaded to leave only when the desert men return from a tribal skirmish. They meet Shirma, an eastern beauty who causes Clipper to reflect, and almost stray from the path of duty. Brown has perforce to guard Clipper as well as the mummy.'
Source: [Radio guide], Wireless Weekly, 1 June 1940, p.26.
Australia : Australian Broadcasting Commission , 1940'When consignments of gold keep disappearing in the South Seas, Clipper and Brown are called upon to do something about it. As the famous sleuths pit their dumb wits against the brains of a pirate gang, they find that the congenial Pacific Islands hold more than strumming guitars and Polynesian beauties. Indeed, they almost get inside information on the cannibal question. However, all's well that ends in victory.'
Source: [Radio guide], Wireless Weekly, 22 June 1940, p.26.
Australia : Australian Broadcasting Commission , 1940