Worlds Away. The Trilogy of Blood and Fire, #3

Justin and Anna, total strangers, leave the world behind to venture off into the unknown. But as their relationship grows, the land changes beneath their feet, revealing places and characters that couldn't possibly belong on Earth. When they witness the kidnapping of a child, more is at stake than their budding relationship. The girl is Divinity, the Child of Light, and she is at war with the Dragon.
Determined to rescue Divinity, Justin and Anna journey into unknown worlds and magical landscapes, aided by characters from other times and places. But as the final showdown between Divinity and the Dragon draws near, The Child of Light has a plan of her own.