In the book, the 'book-within-a-book' (like in Magpie Murders, which I read at Christmastime several years ago in the midst of an horrendous bout of flu) all comes in one chunk. This is all very well, but I did find myself finishing the Pünd story it and then having to readjust my brain to thinking 'Susan who?, Alan who?'
That sounds like an even stranger format! :P
You might find this of interest (from google):
Does Tim McMullan have an eye condition?
Yes, he does. Tim McMullan's distinctive eye appearance is due to a rare medical condition known as Blepharophimosis syndrome.
According to Cleveland Clinic, Blepharophimosis syndrome, also called BPES, is a genetic disorder that affects how your eyelids develop and look. This syndrome is categorised by narrow eye openings, droopy eyelids and folds of skin on the inner part of the eyes going from the bottom to the upper corner.