Each chapter or story involves a separate mystery that is solved through the interaction between the characters of Mr Satterthwaite, a socialite, and the eponymous Mr Quin who appears almost magically at the most opportune moments and disappears just as mysteriously.
Setiap bab atau cerita melibatkan sebuah misteri terpisah yang dipecahkan melalui interaksi antara karakter Mr Satterthwaite, seorang sosialita, dan eponim Mr Quin yang tampil hampir magis pada sebagian besar momen kesempatan dan menghilang secara misterius.