Sophie's talents are getting stronger and, with the elusive Black Swan group ignoring her calls for help, she is determined to find her kidnappers but a daring mistake pushes her world to the edge of war, and soon she has exposed a a major conspiracy that could threaten all she loves.

Santa's son Arthur discovers that a little girl has been missed when they delivered the presents and tries to save the day.

Gilbert the Goblin is positive he can work harder than any elf, and so, in his best elf disguise, he infiltrates Santa's workshop to prove it.

After receiving a mysterious message summoning him to a meeting, Geronimo Stilton finds himself back in the Kingdom of Fantasy, summoned by the Elves, who want him to travel to the Great Explanatorium to find an answer to the earthquakes that are threatening the Kingdom.

Publisher Annotation: During a sleepover, a letter comes to five children begging for the urgent assistance of Esther Mettlestone-Staranise; she must arrive before 10am on Monday to save an entire town of elves trapped under layers of silver. And a regular-size boy who, soon after seeing the children, dies. Oscar is that boy who skipped school in our world on Monday to skate, and found himself in the city of the elves at just the wrong moment: He...

It's Christmas Eve, and Santa needs YOUR help in this fun, interactive picture book from the New York Times bestselling author of How to Catch an Elf! It's Christmas Eve, and everything at the North Pole is going according to plan...until an elf discovers that Santa doesn't have a present ready for Mrs. Claus! Time is running out, and you're the only one who can help. But you'll have to honk, whistle, wiggle, and shake to make things turn out all...

Santa Claus has a complicated and sophisticated Christmas operation, which includes the training of and numerous jobs for his elves to the celebrations at his own Christmas Day party.

"Greg Belmont learns he's anything but ordinary when he discovers he's a real, live, fantastical dwarf and sets off on the adventure of a lifetime"--

Ollie has always been happy just being an elf and inventing new games for Christmas with his best friend Celia--but then the current Santa (descendent of the original) decides to retire and announces that there will be an open competition for the position of next Santa (his son Klaus is not pleased) and suddenly Ollie and the other elves are vying with the Santa children for the Big Red Suit.

New York Times and USA TODAY bestselling Keeper of the Lost Cities series. Sophie Foster is struggling. Grieving. Scrambling. But she knows one thing: she will not be defeated. The Neverseen have had their victories-but the battle is far from over. It's time to change tactics. Make sacrifices. Reexamine everything. Maybe even time for Sophie to trust her enemies. All paths lead to Nightfall-an ominous door to an even more ominous place-and Sophie...