This is an amazing book series. I'm sad that it's ended... With each book the story gets wilder and better. In this one , Butler almost dies and Artemis and Holly bring him back , but physically he's like 20 years older.
In the fourth book , Artemis Fowl has lost all memory of fairies and Opal Koboi , his worst enemy and the greatest villain among fairies , is hunting him down! Luckily he thought of a way to make himself remember before his memory got wiped , and saves the day once again!
Artemis Fowl's mother is suffering from a deadly disease , and the only hope is extinct--And Artemis is the one who caused it's extinction! Now he must travel in time and stop his younger self from exterminating the animal so that he can save his mother. Has Artemis Fowl met his match--Himself?