"A young troll named Hawthorn is stolen from Fairyland by the Golden Wind, and becomes a changeling in our world, a place no less bizarre than Fairyland in his eyes"--

One week after their eleventh birthday, the Fowl twins--scientist Myles, and Beckett, the force of nature--are left in the care of house security (NANNI) for a single night. In that time they befriend a troll who has clawed his way through the earth's crust to the surface. Unfortunately for the troll, he is being chased by a nefarious nobleman and an interrogating nun, who both need the magical creature for their own gain, as well as a fairy-in-training...

The second Fowl Twins adventure, a spinoff of the ... Artemis Fowl series, starts with a bang--literally. Artemis's little brothers Myles and Beckett borrow the Fowl jet without permission, and it ends up as a fireball over Florida. The twins plus their fairy minder, the pixie-elf hybrid Lazuli Heitz, are lucky to escape with their lives. The Fowl parents and fairy police force decide that enough is enough and the twins are placed under house arrest....