Mighty and Brennon, two feline brothers, fall down a rabbit hole and discover a mysterious land.

Mighty the Cat's curiosity lead him down a rabbit hole and showed him a whole new magical world, but not all is as it seems. Mighty and Brennon travel through Wonderland while looking for an exit so they can get back home before their human mom starts to worry, and they find out about a group of cats that allegedly went missing in Wonderland. The two buddies meet creatures and all kinds of animals such as a big dog and a caterpillar which they hope will reveal more about the mythical bird cage and the case of the missing cats.

After some sleuthing and wrong turns, the felines gather more clues about the missing cats. Mighty and Brennon are forced to eat strange foods to survive which make them grow big and makes Brennon look like a tiger. Their world turns upside down again when they meet the peafowl queen. The mean queen wants to put anyone who gets in her way into a bird cage. The cats have to take orders from the queen, attend a court case, and play a game of croquet. They need to free Wonderland's animals from the queen's power grab. Will the two cats find their escape in time and rescue the cats who are trapped in a cage?

Children will enjoy this delightful and unique retelling of Alice in Wonderland. Cat's Adventures in Wonderland is the sixth book of the Mighty and Brennon series, and the books in this series can be read in any order.