Lori arrives to find a creepy Victorian mansion with turrets and towers. But her hosts, newlyweds Nicola and Paul Hollander, warmly welcome Lori into their home. Lori works through the inches of dust and spider webs to examine the library's books -- and there she discovers a trove of love letters dating from WWI, written by a young lieutenant to his lover Claire, Nicola's great aunt. One of the letters hints at a hidden treasure somewhere within Tarrant Hall.
Lori is surprised when this news seems to disturb rather than intrigue Nicola, and as All Souls' Eve approaches, Nicola confesses to hearing bumps in the night. She wants to know: does Lori believe in ghosts?
Aunt Dimity guides Lori toward uncovering the mysteries of Tarrant Hall -- which involve old family secrets and otherworldy spirits -- and it all turns out to be much more interesting than evaluating a rare book collection.