Biggles Combined Operation

In this adventure, with some Interpol colleagues Biggles, of the Special Air Police, cleans up a dope racket threatening the United States.

goodreads summary

Biggles attends an International Police Conference in Paris and meets Eddie Ross, a policeman from the United States. Eddie has major concerns about drug trafficking in the United States where the problems include teenagers being hooked on drugs by being supplied them in chocolate. Biggles warns Eddie that his speech at the conference will draw the attention of the drug gangs to him and indeed, as they speak, Biggles concludes that Eddie is being followed. With the help of Marcel Brissac and Ginger, the tables are turned and their stalker becomes the one under surveillance.