A Guide to Deduction is the ultimate handbook for any aspiring Sherlock Holmes or Watson. Building on the massively successful aguidetodeduction.tumblr.com, the book includes not only advice on deducing aspects of an individual but on a wide range of skills every detective needs. Learn how to build a mind palace, interrogate and break codes on a par with the world’s only consulting detective. A Guide To Deduction is available from all good bookstores including The Strand Magazine, Amazon USA, Amazon UK, Waterstones UK and for free shipping worldwide Book Depository . In ebook format it is in Kindle and Apple iBooks (iPad/iPhone).