The Battle of The Labyrinth

In the book Annabeth, Percy, Tyson and Grover go on a quest into the labyrinth! They have to find Daedalus, the inventor of the maze, before Luke, the half blood who turned to the Titans Side. In the final scene the camp gets invaded, by Luke and his army! It was a great book.The next and final book to this series is

                                                                        The

                         

                                                       Last

         

                                                   Olympian