Katie O'Conner doesn't realize that her habit of questioning everything annoys adults. But when Katie finds a secret library, along with her three friends and little brother, she finally finds some answers to her questions. The problem is that seven evil Enemies of the Library and their Dark Master are trying to take over the world. Can Katie, her friends, her brother and the Library's caretaker, defeat them?

The Serpent of Rock Lake is book #2 in The Library Kids series and continues the adventure of Katie O'Conner and her friends after they find a secret library inside the Blue Mounds. Now they're on a mission to collect twelve crystals in order to stop the Dark Master and the Enemies of the Library, once and for all. But finding the first crystal won't be easy. The Library Kids adventure continues as the group takes a trip back in time to a Wisconsin homestead, which results in meeting Richard's maternal Ho-Chunk ancestors and a mysterious 15,000 year-old leprechaun. A meeting with Mother Earth...

The Library Kids Cry of the Banshee is book number 3 of 7 in The Library Kids series. The story continues with Scott sneaking into the secret library and going back in time to World War II to visit his grandfather where he trains with him to be a soldier during the war. They end up in the Philippines and the Spirit of Forgetfulness is plotting to hurt Scott and his grandfather and change the outcome of the war. A banshee is sent to warn Katie and tell her she must help bring her friend Scott back home before it's too late. To do so, Katie and her friends must learn about pivotal points of...

The Library Kids Talking Stones is the 4th of a 7 book series that continues with the children learning the importance of messages in stone by studying ancient artifacts at the Chicago Oriental Museum and then studying the history of Mount Rushmore. The crystal mission heats up in Mexico and Peru as the children must battle an evil sorcerer to retrieve the fourth and fifth crystals. At the end of the mission, Scott's father returns for a surprise visit and reveals a secret about himself.

The Library Kids Princess of Tara is the fifth book of a seven book series. Katie O'Conner travels to Ireland with her friends and family to retrieve the 6th and 7th crystals with the help of her 15,000 year old leprechaun friend, Liam. They battle the Enemies, meet ancient fairies and outwit an Ogress along the way.

Katie O'Conner and her friends travel to Africa to retrieve the 8th and 9th crystals. They will meet a Dogon Elder and the Goddess Sekhmet along the way. The battle with the Enemies is ongoing and a new set of Enemies called the Group of Thirty-Three makes themselves known.

Katie and her friends must battle the Enemies again to retrieve the last three crystals. They will use their wits to find the tenth crystal in India and they will have to use their martial arts training to battle the Dragons in Tibet. They will use their will power to battle the Dark Master in his temple for the final crystal, with the help of an Aborigine woman.

Who haunts the barn at the Volo Antique Mall in Volo, Illinois? Find out his story and who he was and how the Civil War affected him and his family and learn about their secrets.