Enoch's Return: Pride's Downfall Book 4 - 9798986319292

Toby was looking forward to celebrating his 21st birthday with family and friends. However, the day is shattered by the arrival of his sister, Erica, fresh out of the juvenile detention center, where she has lived in isolation most of her life. There is something very wrong with her still; witness her biting the ear of her taxi driver and licking the blood from her lips, and the way she antagonizes everyone around her. The other thing that is very off-putting about the day is a gift he receives - a musty tent and a few iron spikes that have been lying in the ground for years. Toby faints at the sight of the "treasure," while Erica reacts violently and runs off to who-knows-where.
While he is unconscious, Toby learns who he truly is, and of his mission.