Vague Directions: Into the Woods. The Reenactment Realm, #1

Heather came to a medieval reenactment to escape modern reality. Instead, she walks straight into a hidden war. A weekend of candlelit feasts, knights, and medieval pageantry turns deadly when a ruthless shifter marks Heather as his next victim. Suddenly, the fantasy surrounding the campground isn't fantasy at all. Ancient magic is real, supernatural predators hide in the shadows, and one who targeted her has followed her there.
Sir Roland appears to be another costumed gentleman knight enjoying the festivities, but beneath the polish is an elite ranger sworn to protect humanity from the creatures that lurk just beyond ordinary sight. As darkness closes in, Heather discovers she possesses abilities she never knew existed, abilities awakened by a mysterious golden owl whose warnings only she can hear. To survive, Heather must trust the impossible, master powers she cannot explain, and fight beside those who have secretly defended mankind for centuries.
Welcome to the Reenactment Realm. Where history is only the beginning. Where magic walks unseen. And not everyone at the reenactment is pretending.