The Phantom Tollbooth tells the story of a bored young boy named Milo who unexpectedly receives a magic tollbooth one afternoon and, having nothing better to do, decides to drive through it in his toy car. The tollbooth transports him to a land called the Kingdom of Wisdom. There he acquires two faithful companions, has many adventures, and goes on a quest to rescue the princesses of the kingdom from the castle of air, Princess Rhyme and Princess Reason. The text is full of puns, and many events, such as Milo's jump to the Island of Conclusions, exemplify literal meanings of English language idioms.