Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin.

Asperides, an ancient demonic talking sword, tricks Nack Furnival, a bumbling would-be knight, into battling a wicked sorcerer bent on summoning all the evils of the underworld.

Much to their initial dismay, a twelve-year-old boy and girl discover they are destined to become knights of King Arthur's legendary Round Table, but first they must find and reforge Excalibur and break a curse that has weakened the magic of the Twenty-Five and a Half Realms.

Odo is the seventh son of the village miller and he just wants to get away from work for awhile, Eleanor's mother was a soldier, and she yearns for adventure, but it is Odo who finds the magic talking sword named Biter, and thereby instantly becomes a knight--and together they set out on a quest (somewhat reluctantly on Odo's part) to save their kingdom from threats both human and dragon.

Barb is a Berzerker, part of an elite crew of warriors who protect the land of Bailiwick from the scourge of monsters. The evil Witch Head has captured all the adult Berzerkers and Barb's the only one who can save them. But she's not alone--Barb's got her own amateur crew of would-be zerks, made up of farmers, monsters, and her best pal Porkchop the yeti. This ragtag gang must infiltrate Maug Horn, the monster capital where only monsters are allowed,...