Discover an underwater Greek civilization, once thought to be lost to a volcanic eruption hundreds of years ago. A blacksmith who was transported to this place many years before finds a very young girl one fateful day washed up on the beach. A battle between forces, our Peregrines and the Greek soldiers, for the armor piece being used by the Greek military leaders. Be drawn into the largest demon battle yet to come using creatures from Zanchier, a desert tribe, and an army of the dead that are called back to life to aid in the fight. Many will lose their lives in this battle of good versus evil. After the battle, an old foe makes an unexpected appearance to Reader's Island, their sanctuary. This was something that was thought to be impossible, as no one outside of the anointed of God has ever been allowed on Reader's Island. Several Peregrines have very negative and harsh feelings toward the intruder, especially since his cruelty toward them back on Zanchier is still very fresh in their minds. Others are very confused by his presence, being he is the first non-Peregrine to ever leave Zanchier or travel through the barriers without suffering instant death. Life seems to be changing for everyone in this, Book 4- Water, in the Peregrination Series. Continue the story with Book 5 - The Final Battle; Battle of the Beasts, the last book in the Peregrination Series.