When a flood of perfectly faked banknotes hits the market, retired art teacher Miss Emily Seeton, Scotland Yard's famed 'MissEss', is chosen to investigate a respected Geneva bank. Somehow, the forger is also mixed up in the theft of valuable paintings, so it's 'set an artist to catch an artist'. But Miss S. is new to air travel - surely the names Geneva and 'Genova' must be the same place? Bamboozling both the crooks and the police who vainly try to keep tabs on her, innocently humming the fraudsters' musical password, she trips gaily along the dangerous trail. Serene amidst every kind of skullduggery, this eccentric English spinster steps in where Scotland Yard stumbles, armed with nothing more than her sketchpad and umbrella!