The City of Ember: Chapter 16

In chapter 16, The Singing, Lina had failed to escape the guards, and they took her to the mayor. But just as he was going to officially arrest her... the lights went out. Lina immediately, with put thinking, ran for the roof. Once on the roof, the lights went on, and Singing began. The city filled with voices, happily singing, obvious to what was going on around them. But just as they had come on, the lights, again, went out towards the end. But the singing didn't stop. And once it did, the people remained in darkness. Nothing was happening. No lights. Darkness. Was this the end? But no, Lina saw the candles glowing brightly, and heard people scream in terror of the light. She knew it was Doon. And as the lights went on, she joined him.

QUESTIONS: Will Lina make it to the river with Doon? Will others follow?