Mysterious Disappearances Vol. 4 (Rated Older Teen 15+)

A Tsukumogami is an inanimate object that gains life after one hundred years of service to its master--but the accelerationist digital age means that modern devices are gaining souls right now! What can a burnt-out novelist and some devilish siblings do about it?! Especially when they also must face some classic mysteries, including the Princess of Books, and that infamous harbinger of truth, the black cat!