Echoes in the Dark (The Summoning #5)

The planet is dying, slowly being drained by an alien Dark, and only one last, desperate plan can save it.

Deep in another dimension, a disillusioned young singer is summoned as Lladrana's last hope. Uncertain of her future, unaware of her extraordinary magical talent, Jikata will be the sixth and final outsider—Exotique—to step through a dangerous portal of prophecy and magic. Survival will require her to forge closer friendships than she has ever known. The price of those bonds will threaten the very fate of Lladrana: a world where music holds the key to an ancient mystery—and six women will wage the ultimate battle against the forces of Dark.