In the fourth book of the series, our young adventurers and their seahorse friends must somehow survive the Octopi's dreaded Arena of Death. They will face an old foe and a deadly new one, as well, in the Contest of Champions. Upon safely returning to the underwater city of Mindar, Mark has only one thing on his mind... marrying the Royal Princess of Mindar. But, will she say yes when he pops the question? Sometimes in life, things aren't always what they appear to be. Are you ready to discover the shocking secret of the Blue Pearl?