As her senior year of high school starts, Laurel is just beginning to adjust to Tamani's absence when he suddenly reappears, telling her he must guard her against the returning threat of the trolls that pose a danger both to her and to Avalon.

Emma and Eadric travel to Upper Montevista to ask his parents to bless their upcoming marriage and discover that Eadric's younger brother has been kidnapped by trolls.

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...

"Laurel, Tamani, David, and Chelsea race to defend Avalon from Yuki and Klea--but they realize that there may be nothing they can do to save it"--

Three clever billy goats find themselves trapped in a video game, confronting the Hillside Castle run by a monster troll--and they have to use their new superpowers to get past the castle to the green field of grass, and lunch.

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....