Artemis Fowl series

Artemis is at boarding school in Ireland when he suddenly receives an urgent video-email from Russia. In it is a plea from a man who has been kidnapped by the Russian Mafiya: his father. As Artemis rushes to the rescue, he is stopped by captain Holly Short of the LEPrecon fairy police. But this time, instead of battling the fairies, he is going to have to join forces with them if he wants to save one of the few people in the world he loves.

After his last run-in with the fairies, Artemis Fowl's mind was wiped of memories of the world belowground and any goodness grudgingly learned is now gone with the young genius reverting to his criminal lifestyle.

When Artemis Fowl's mother contracts a life-threatening illness, his world is turned upside down. The only hope for a cure lies in the brain fluid of the silky sifaka lemur. Unfortunately, the animal is extinct due to a heartless bargain Artemis himself made as a younger boy. Though the odds are stacked against him, Artemis is not willing to give up. With the help of his fairy friends, the young genius travels back in time to save the lemur and bring...

Seemingly nothing in this world daunts the young criminal mastermind Artemis Fowl. In the fairy world, however, there is a small thing that has gotten under his skin on more than one occasion: Opal Koboi. In The Last Guardian, the evil pixie is wreaking havoc yet again. This time his arch rival has reanimated dead fairy warriors who were buried in the grounds of Fowl Manor. Their spirits have possessed Artemis's little brothers, making his siblings...