In Nancy Drew and the Ghost of Blackwood Hall, a legendary detective takes on a new case. Nancy gets help from Mrs. Putney's widow. She is disturbed by the ghost of her deceased husband, who asks to bury a box of family jewels in the forest. But when Mrs. Putney realized her mistake, it was too late: the jewels were stolen from the box, and fakes were put in their place ... Not believing in the tales of ghosts, Nancy connects her intuition and common sense and tries to get on the trail of the kidnappers . Circumstances lead her to the old Blackwood Hall mansion, where rituals of spiritualistic sessions are held. It turns out that these sessions are attended by many residents of the town, including Mrs. Putney .. Trying to draw a parallel between the sessions of spiritualism and a series of mysterious events related to the extortion of money and valuables, Nancy Drew receives more and more messages "from the other world": do not get into this business, otherwise it will be worse ... For middle school age