This week on the water I’ve beaten this drum repeatedly over the past few months, but I thought I’d give it one last tara-diddle before I lay the sticks down… Years ago, I urged one of our mentor programme participants to write the murder mystery she was contemplating from the perspective of a blind character. There were many good reasons (I thought) to do so, not least of which that it would lead the killer to mistake what she could or could not observe. (Don’t people always underestimate...