That weird head-hopping stuff.

Writing a book is about establishing a connection between the reader and the character in the book. No matter how excellent the historical details, how correct the description of everything from how to dismantle a gun to how to perform emergency surgery in the wild, unless the reader is invested in the characters, the read will leave them at most lukewarm. Unless, of course, they read the book precisely to find out how to dismantle a gun, but generally expectations on a work of fiction are so...