After disappearing for three years, Artemis Fowl has returned to a life different from the one he left. Now he's a big brother, and spends his days teaching his twin siblings the important things in life, such as how to properly summon a waiter at a French restaurant.
But 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.