Part 3 of Trilogy -- Amazon's Description

Amanda Hocking is an indie publishing sensation whose self-published novels have sold millions worldwide. Ascend is the final chapter in her bestselling Trylle trilogy?and you'll never guess how it ends!

Wendy Everly finds herself in a harrowing predicament. The only way to rescue the Trylle from their most formidable adversary is to sacrifice herself. Refusing to submit to the Vittra would plunge her people into a merciless battle with an invincible enemy. But can Wendy bear to abandon her friends, even if it's their only hope of survival?