The twelfth and last Dr Kang story.
An industrialist's son has been kidnapped and he calls in Dr Kang to negotiate his release. At the beach Dr Kang hands over a million francs to a man who comes ashore from a yacht called the MARITA. The name is enough to show Dr Kang who the plotters are.
Glasgow Evening Citizen, 28th December 1956.
Also presumably appeared in the Evening Standard the previous week, though I have not verified this.