Here's a very brief plot synopsis:
"A brash young lawyer attends an old friend's wedding at an isolated mansion in the Pacific Northwest. The mansion is crumbling, the bride's family is creepy, and the lawyer begins to suspect that his friend might be under the influence of supernatural forces. The lawyer and the other guests soon find themselves imprisoned in the decaying mansion, and they must use their wits to battle their mysterious assailants, protect each other, and escape with their lives and their sanity."
The book also contains some cool action sequences, a romance, and tons of suspense.
I hope you check it out and let me know what you think!