Percy Jackson and the Olympians, Book Two the Sea of Monsters (Percy Jackson and the Olympians, Book Two) : Paperback : HYPERION : 9781423103349 : 1423103343 : 31 Oct 2011 : In this second installment in the series Percy, Poseidon\'s 13-year-old demigod son, is desperate to rescue his friend and retrieve the healing Golden Fleece--the only protection for the children in Camp Half-Blood. Adventure follows chaotic adventure as Percy once again battles mythical monsters in modern-day settings.