A Haunting on Forsyth Street - The Savannah Time Travel Mysteries, #3.5

When a group of curious teens decide to spend the night in a haunted mansion in 1924 Savannah, they get more than just a few laughs and some thrills. When terrifying screams echo through the mansion in the middle of the night, they flee for their lives-except one of them will never do anything ever again. When amateur detective Georgia Belle is begged by a new neighbor to find her son innocent of the murder of the dead teen, Georgia's investigation reveals much more than slammed doors and creaking footsteps in a mansion that has always delivered what it promised.
She finds an evil that just might already have her in its sights.