Greta and the Goblin King

While trying to save her brother from the witch three years ago, Greta was thrown into the fire herself, falling through a portal to a dangerous world where humans are the enemy, and every ogre, goblin, and ghoul has a dark side that comes out with the full moon.
To survive, 17-year-old Greta has hidden her humanity and taken the job of bounty hunter—and she's good at what she does. So good, she's caught the attention of Mylena's young Goblin King, the darkly enticing Isaac, who invades her dreams and undermines her determination to escape.
But Greta's not the only one looking to get out of Mylena. The full moon is mere days away, and an ancient evil being knows she's the key to opening the portal. If Greta fails, she and the boys she finds stranded in the woods will die. If she succeeds, no world will be safe from what follows her back . . .