The Girdle of Hyppolita by Agatha Christie

One of Poirot's labours - two cases; a missing painting and a missing girl. Poirot is only interested in one, but soon finds he must tackle them both. From The Labours of Hercules.

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Poirot is called upon by a gallery owner to investigate a painting stolen after a party, but he is more interested in a case Japp has, involving missing school girl, Winnie King. Can Poirot find out what links a stolen Rubens miniature painting called "The Girdle of Hyppolita" and an exclusive finishing school in Paris?

Published in 1939 in the USA under the title The Disappearance of Winnie King and in 1940 in the UK in Strand Magazine.