The Suvivors. Creekside Chronicles, #7

On Len's thirteenth birthday, he tells his friend Alex that he wants to bring the remaining orphans home from their underground cities. Alex is all for it. The two friends approach Lulomen, the director of Creekside Meadows. Soon, a plan is devised. Len, Abagail, and Rex will journey to Metro Metropolis to rescue the remaining girls, and Alex, Zelda, and Orly will go to Tiran and rescue the remaining boys.
Little do they know that Supreme Commander Reginald Botta and Colonel Winslow Pinchet have added to the already tightened security in both locations. They've even hired security expert Wanda Denton to help. With their friend Charlie and his group of rebels providing reconnaissance, the two teams begin their dangerous mission. They have courage, but there are many obstacles in their path. Will they have the skill (and luck) to pull it off?