When Lulu and Elizabeth find themselves in Camelot, they are expecting to meet King Arthur and the Knights of the Round Table. Instead, the twins enter the worl

"With the discovery of Mrs. Magpie’s Manual of Magic for Mathematical Minds, Lulu and Elizabeth embark on an exciting journey to a realm inspired by Lewis Car

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! When Jack and Annie receive an i

KING ARTHUR OF CAMELOT: The History & The Myth of King Arthur and the Knights of the Round Table is an expansive anthology that presents a meticulously curated

Sixteen of today's greatest unsolved mathematical puzzles in a story-driven, illustrated volume that invites readers to peek over the edge of the unknown. Most