The Lost City of Faar is the second book in the Pendragon series by D. J. MacHale. Imagine a world covered entirely by water. People live on immense, floating cities and grow food on the sea floor. It's an idyllic world until Saint Dane unleashes a deadly poison. To save the territory, Bobby battles pirates on the surface and killer sharks below, all in hopes of finding salvation on a legendary underwater city called Faar.
After discovering that Bobby's parents are gone, he and Uncle Press leave behind the place where Bobby's house used to be, leaving on another adventure. Uncle Press drives his car to an abandoned subway station, the location of the nearest flume. They step up to the door marked with a star and shout "Cloral!" As Bobby makes his way through the flume, Uncle Press reminds him of the Cannonball.
As soon as Bobby gets to the end of the flume, he realizes what his uncle meant. As he land waist-deep in water, he is reminded of a water slide called the Cannonball. Uncle Press soon joins him.
With enthusiasm, Press exclaims that this is his favorite territory. Press puts on the Cloral clothes, which are wet suits. He then puts on an air globe, which molds into the shape of his head. He can now breathe underwater.
Uncle Press sends bait out into the water to attract the quigs away from them. Quigs are guardians of flumes for Saint Dane. They are different for each Territory. On Cloral, they are large, voracious sharks. As bait, Press attaches fruit to a water sled used to propel people through the water. Then they set off into the ocean.
En route to Grallion, Bobby and Press are joined by a native; a reckless, jolly, athletic traffic officer called Vo Spader. Spader leads them to Grallion, where they assume identities as fruit harvesters. As such, they become friendly and learned with all Clorans.
Saint Dane's threat to Cloral is a poison; a mutation of the fertilizer that agronomers have been developing. It claims the life of Spader's father. Press and Bobby help Spader realize that he is a Traveler, and they search for the mythical city of Faar, which may be able to provide an antidote for the poison. The city has been underwater for generations, but their leaders decide to "transpire", or come to the surface, to save Cloral.
In the aftermath of the victory, Spader tries to get revenge on Saint Dane, a reckless act that leads to Press's death by gangsters from First Earth. After Press' funeral, Bobby and Spader Travel to First Earth, setting the stage for The Never War.