An English Gentleman by Sky Gilbert is one of those books (like What Was She
Thinking? by Zoe Heller) where the narrator ends up saying more about
himself than the topic he is discussing. The main character (narrator) is
given some letters from J.M. Barrie to his adopted son, and sets about
debunking some of the scholarship on the topic. Meanwhile, his own life
parallels what's going on in the letters, and he ends up revealing more
about himself than insight into the letters.

The letters aren't real - I had to google to find this out, which is
testament either to the author's skill or my own ignorance. Other than