Follows the adventures of a group of neighborhood children who create costumes from cardboard and use their imagination in adventures with knights, robots, and monsters.

"The kids of the Cardboard Kingdom go on a new adventure! This time, they are in search of new friends--but what they discover is a lot more like enemies... It's winter break in the Cardboard Kingdom, and kids from the town across the park want to play together! But according to the evil Sorceress, not just anyone can join the kingdom... So it's not long before the two communities spiral into battle. Will the Sorceress realize the error of her ways before all hope is lost? Will friendship still manage to win the day?"--Amazon.com.

"It's nearly Halloween in The Cardboard Kingdom, and one thing is for sure: a mystery is afoot. Nate is positive he saw a monster in his backyard. It wasn't a shadow or a rustling tree. It wasn't his eyes playing a trick on him. It was a monster, plain and simple. But the trouble is, no one believes him. Even his stepbrother, Elijah, says he must have imagined it... Until it shows up over and over again in the kingdom. Always at night, always on the move. This monster is quick, and it's, well, super scary. Even Vijay the Beast is rattled by this menacing new creature. But what does the monster want? Why has it come to the kingdom? And what can the kids do about it? It will take the greatest heroes, scientists, and sleuths in the Cardboard Kingdom to crack the case!"--Book jacket