Ben Mears has returned to his hometown to write a book about the supposedly haunted Marsten House. When people around the Marsten House start dying mysteriously, Mears discovers that the owner of the mansion is actually a vampire who is turning them into an army of undead slaves.

该剧改编自三上延同名小说，讲述的是由于体质问题不能读书的五浦大辅，将去世的祖母留下的旧书卖到古书堂彼布利亚的时候，因缘巧合地结识了店主筱川栞子并开始在古书堂工作。筱川虽然不善言谈，但推理能力十分出众，通过对藏在旧书里那些细节的归纳和推理，他们解决一个又一个与旧书相关案件的故事。