Monster by Frank Peretti is one option. It is Frank Peretti so is a "Christian fiction" book, but I don't remember there being too much preaching (it has been a while though).
"Miles away from the hectic city, Reed and Rebecca hike into the beautiful Northwester woods. They are surrounded by gorgeous mountains, waterfalls, and hundreds of acres of unspoiled wilderness.
During their first night camping, an unearthly wail pierces the calm of the forest. Then something emerges from the dense woods. Everything that follows is a blur to Reed—except the unforgettable image of a huge creature carrying his wife into the darkness.
Enter into deep wilderness where the rules of civilization no longer apply. A world where strange shadows lurk. Where creatures long attributed to overactive imaginations and nightmares are the hunters . . .and people are the hunted."