In the shadowy streets of 1936 Oxford, England, members of a secret society keep turning up dead. When J. R. R. Tolkien, C. S. Lewis and their fellow literary masterminds, known as the Inklings, are called upon to catch a killer, they trade their pens for magnifying glasses. With time running out, they get a helping hand from mystery writers Agatha Christie and Dorothy Sayers to unravel a sinister web of secrets.