Kingdom Come

HE'S A SERIAL KIDNAPPER, RAISED IN AN UNDERGROUND CULT. NOW, HE IS THE ONLY ONE WHO CAN STOP THE END OF THE WORLD.

Adam is a Rescuer, a man who takes children out of what he deems bad situations by convincing parents to give them up. He takes the children to his underground world, where they are welcomed and raised by The Family and their leader, a man they call Father. After his latest mission, Adam learns Father is ready to trigger a catastrophic event that could end life above ground. The more Adam learns about what it takes to make his underground utopia thrive, the more he begins to doubt his beliefs. Now, Adam must decide if the above ground world is worth saving.
Excerpt
Adam reminded himself to smile as he approached the little girl. "Wow, you're fast!"
"Mommy and I race a lot. She says I can be a track star when I grow up."
"I bet," he said. Of course, the mother's only reason for teaching the girl how to do something well was for personal glory.
"Are we there yet? I'm hungry."
"We just ate at the restaurant, and you had a snack before we went into the tunnel."
She tilted her head back. "That was hours ago!"
"It was less than an hour ago, but we'll be there soon."
It wasn't just her, most of the children he rescued behaved exactly the same way. He tried to carry them when he could, but parts of the hike included narrow or steep passes that were safer to navigate with both people on foot. It almost made him wish he could just drive them to The Family, but he knew that was impossible. Their home must remain a secret. He couldn't risk being followed, and an hour hiking through the woods and then another hour in a hidden tunnel was the best way to keep that secret.