The Sea of Monsters is the second installment in the series, released on April 1, 2006
Camp Half-Blood is under attack when ______'s tree, which guards the borders of the camp, is poisoned and slowly begins to die. In order to save the tree and the camp, someone must recover the Golden Fleece, which is somewhere in the Sea of Monsters, the Bermuda Triangle. At the same time, Percy finds out that _____, who has left on a quest to find the missing god ___, has been captured by the _____ and that the Fleece is on Polyphemus' island. Together with _____ and his half-brother ____, a _____ who just arrived at the camp, Percy sets out to rescue _____, even though _____, who had replaced ______, prohibited him from doing so. Meanwhile, _______, daughter of _____, is sent on an official quest by Camp Half-Blood to retrieve the Fleece. The trip to the Sea of Monsters is long and hazardous and along the way the heroes encounter several dangers including _____ and _____, the sorceress _____, the _____ and their former friend _______. Percy also learns about a prophecy from the _____ about a child of one of the three most important gods (_____, _______ and _____), also called "the Big Three", playing a vital part in the success or failure of the resurrection of _____ the Titan-King and saving Olympus. The heroes eventually retrieve the Fleece and restore ____'s tree but also unknowingly revive _____ herself, daughter of ____, who had been turned into the tree by her father when she sacrificed herself for _____ and ____ to get safely to Camp Half-Blood years earlier.