Ravenswood by Christine Zolendz

They’re DYING to get in…
In the southern swamps of Louisiana, an ominous and foreboding mansion beckons the young and curious tourists. But once they enter Ravenswood, they never return.
And New Yorker Rainey Halerow knows nothing about it…
That is until her grandmother is brutally murdered under her nose and the answers to her mysterious and heinous death lie within the walls of Ravenswood. As the mansion lures her in, Rainey knows one thing is certain: more than death is trapped inside.