The Sayers Swindle (Standard format, CD, Unabridged edition)

When Jordan manages to locate her boss's missing books, they are in the possession of Randolph Adams, an elderly man in a nearby town. Offering a valuable Hemingway first edition as an incentive, Jordan thinks she's about to seal the deal--but some of Randolph's relatives think he should hold out for more.
Then the entire family disappears--and a dead body shows up. It's up to Jordan to collect the clues--and make sure a killer gets booked.