By Robert House. Foreword by Roy Hazelwood (yes, that one). I understand the skepticism that greets claims like "the only realistic and convincing solution to the notorious mystery of Jack the Ripper," not to mention the term "Ripperologist," which...it's all just kind of tiring. House's book is legit: well written, doesn't disappear up its own dupa with dead-end theories about minor dukes.
This paperback is new from the warehouse.