Hiding beneath all the CGI Sturm und Drang is a powerful story about what it means to have a home and, conversely, what it means to be lost. Bilbo, as he explains in the best scene in the film, loves and misses his books and his armchair and his garden back in the Shire; but in missing them he has learned their true value. And this has given him compassion for those who like the dwarves have had their home taken from them — and even for Gollum, whose most precious possession has been taken from him.