It reflects only the surprise as this third book is very different from the first: a more complex, fragmented structure Action, multiple characters.
It is also a more mature work: less Manichean, more bitter, less idealized.
K.Hosseini kept his incredible sense of the story and characters but adds a real human depth.
The reconciliation with the film "Babel" of A.Inarritu seems obvious.
A must read;