Today'sradioconceptis "Break from the regular form of broadcast". Theywill becalling many and unspecified listeners who sentSMS, without anynoticecall from scenarists.
Hitchcock and his scenarists (Charles Bennett, Alma Reville, Ian Hay, and Jesse Lasky, Jr.) scatter clues like gum wrappers as Ashenden and the General visit Switzerland to find an enemy agent whose skulduggery affects negotiations under way in Palestine.