Ghost of Thornton Hall is the twenty eighth game in the Nancy Drew adventure series. It is based on the 10th Girl Detective novel, Uncivil Acts.
Jessalyn Thornton dared to return to Georgia's Blackrock Island on a late-autumn trip to her family's abandoned - and allegedly haunted - ancestral home, Thornton Hall. However, while exploring the hall with her friend, Jessalyn disappears and is nowhere to be found. Former ghost hunter Savannah Woodham summons Nancy to the island to investigate Jessalyn's disappearance and the strange events taking place at the hall.
Jessalyn visited Thornton Hall with her friend Addison for a pre-wedding celebration and sleepover, but then mysteriously disappeared.
Jessalyn's mother, Clara, stays in Thornton Hall during the search. She is currently the head of the Thornton family business and is usually quite matter-of-fact. In her childhood, she lived at the hall with Charlotte, Harper, and the rest of the family, but has never learned the identity of her father.
Although Wade usually stays away from the rest of the Thorntons, he has returned to Blackrock Island to aid in the search for Jessalyn. However, his shady past makes him an embarrassment to Clara, and he prefers to work in the graveyard near the house, searching for signs of supernatural activity. This belief in the supernatural led him to encounter Savannah Woodham, back in the day.
Known as the black sheep of the family, Harper was always eccentric but became more so after her sister Charlotte's death in 1989, to the point of running away entirely. She maintains that the family has tried to hide her so as to keep their name untarnished, but Clara insists that Harper's tales of being institutionalized are exaggeration.
Colton is Jessalyn's fiance and seems to be genuinely concerned about her well-being. Despite this, he seems to be grappling with some internal tensions, the causes of which are anyone's guess.
Charlotte Thornton died in a fire in 1989, on the night of her 21st birthday party. She was a beloved member of the family, with a beautiful singing voice and an affection for all the Thorntons, even those in the crypt. After her death, people began to see her appearing on the island and within Thornton Hall, and the family soon left the hall altogether.
Nancy uses a cell phone that can be accessed by an icon at the bottom of the screen. She can also receive hints from the task list if she's an "Amateur" Sleuth.
Bess is one of Nancy's best friends, and Ned is Nancy's boyfriend. These characters, although only under a phone call option, offer lots of advice and help for the player.
Addison is Jessalyn's friend and was with her when she vanished from Thornton Hall. The events of that fateful night left her extremely frightened and disturbed, and she is a bit unwilling to help Nancy at first. However, she provides useful information about what happened to Jessalyn.
Former ghost hunter Savannah initially gets Nancy on the case by a phone call, and Nancy can call her from then on to get help with the case.