The Battle of the Labyrinth camp for the school year. On his fifteenth birthday at the summer's end, Percy receives a visit from his father Poseidon, who gives him a sand dollar, admonishing him to “spend it wisely”. Nico later appears to tell Percy his plan to defeat Luke once and for all. "The Battle of the Labyrinth" was initially referred to as "Percy 4" until the title was officially revealed. The novel was teased by Rick Riordan behind the pages of its predecessor, "The Titan's Curse". It was based on the Greek myth of the labyrinth, where the Minotaur was supposedly kept. In his
Walgren Lake Monster to be about forty feet long. Other reported sightings claim that the creature was similar to a very large catfish or mudpuppy. The Nebraska State Historical Society reports that contemporary accounts believed Johnson actually saw an unusually large beaver. The original legend of the Walgren Lake Monster claimed to be corroborated by Native American accounts of a similar beast inhabiting the lake. The initial story of a lake monster which devoured livestock sparked curiosity throughout Nebraska and abroad, even reaching the London Times. According to some articles published at the time, unsuccessful efforts were made to capture the monster. In