Shinokawa Shioriko is the proprietor of Biblia Antiquarian Bookshop, her sidekick Goura Daisuke, her lanky gofer and protector, has trouble reading books; they make him dizzy. Shioriko is demure and introverted, an expert on vintage books, a great storyteller, and of course, a lover of books; she also has amazing powers of logical deduction, and can solve big mysteries from the smallest of clues. The unlikely pair join forces to unravel secrets and hidden meanings to help people looking for answers, and the true answers are never what they expect.