A Killer Clue

"When Eloise Anderson, the owner of an antiquarian bookshop, arrives at the grand Aircroft estate to ask retired librarian Jane Hunter and eccentric collector Cameron Clewe for help, Jane and Cam expect a bookish inquiry. But the bookseller has a different sort of assistance in mind: clearing her mother's name of a murder Eloise is convinced she didn't commit. Eloise's mother has just died after spending many years in prison for allegedly killing Eloise's father. Armed with new information found in her mother's effects, the bookseller is determined to uncover the true killer so her mother can rest in peace--even though the case is now colder than ice"--