Emily "M" Tyme must risk everything to learn the secrets to her magical sextant. She is a mapper, and it is up to her to lead her team to victory in the hunt for the Pieces of the World. Little does she know the fate of the world rests on her shoulders. M, her best friend Zoey, Monty, and her brother Erik must win all the challenges of a dark game played in a seemingly endless castle called Infinite Keep. Watching over them is a mysterious water lord, and a group of super soldier/magicians that fly on horseback. Can they defeat the other teams, or will their fate be decided behind these endless walls? After the adventures of Infinite Keep, the team must navigate the sinister cavelands in order to rescue the benevolent Aunt Nellie who helped them so much. She is on trial, and the team must testify, especially M. However, they must make it through a raging, centuries old battle between the White Frogs and the Bats who are fighting to rule the immense caves.