There are fifteen paintings in the Herve Fairy Folk series. Ten reside in French museums and five are in private collections. But there are rumors of a sixteenth. Whispers circulate in the upper criminal echelons that another Herve exists: The Fairy Thief, depicting a fairy in the act of stealing a human child. Legend has it that Herve gave the picture as a gift to a beautiful Turkish girl he met on the Champs-Elysees.
The girl promptly broke Herve's heart, and sold the picture to a British tourist for twenty francs. Within weeks, the picture had been stolen from the Englishman's home. And since that time, it has been lifted from private collections all over the world. Since Herve painted his masterpiece, it is believed that The Fairy Thief has been stolen fifteen times. But what makes these thefts different from the billion others that have been committed during this time is that the first thief decided to keep the picture for himself. And so did all the others.
The Fairy Thief has become something of a trophy for top thieves worldwide. Only a dozen know of its existence, and only a handful know of its whereabouts. The painting is to criminals what the Turner Prize is to artists.
Whoever manages to successfully steal the lost painting is acknowledged as the master thief of his generation. Not many are aware of this challenge, but those who do know matter.
Naturally Artemis Fowl knew of The Fairy Thief, and recently he had learned of the painting's whereabouts.

The Opal Deception, Chapter 2