After darkness consumes Krissa, is there any hope for salvation?

When Krissa disappears to join the Amaranthine, Fox knows he has to save her. But the magical world beyond Clearwater is more dangerous than he can imagine, and even with Sasha's help, locating Krissa can have deadly consequences.

With time running out before the Amaranthine achieve eternal life and become invulnerable, Fox and Sasha must team up with a menacing group with a fearsome reputation if they hope to find their friend.

But locating Krissa isn't enough. If they can't remove the darkness from within her the Amaranthine will unleash an immortal assassin on the world. Killing Krissa may be the only alternative, but is that a line Fox is willing to cross?