This second page-turner in the Crystal Doors trilogy begins right after the gigantic battle that ended the first volume. Merlons, with the help of the treacherous Orpheon, kidnap Gwen, Vic, Sharif, Tiaret and Lyssandra. As their captivity progresses, they uncover information about the Merlons’ plans for destroying the island of Elantya. The need to warn the citizens of Elantya adds urgency to the five teens’ plans to break free from their captivity. Near escapes and recaptures, new underwater characters and the cruelty and violence of the Merlon world will grab readers’ attention and keep them involved with the story. As a result of their hardships, the teens grow in understanding and mutual support, adding a depth to this chapter in the unfolding story. Although the Elantyans bring the battle to the Merlon, they cause severe damage, but leave the enemy capable of carrying out their plans. The story will be clearer and more accessible to those who have read the first installment. But, as in that one, this fun read will appeal to middle-school fantasy fans. (Fiction. 11-13)