Fiennes is a man who tries to piece together the puzzle after his wife (Weisz) has been murdered in Africa. The story is told in a documentary fashion amid the political turmoil in Kenya. Fiennes and Weisz are both excellent actors and give earnest performances. The problem is that there are too many talking heads and the story wanders all over the place and goes on forever. It takes an effort to keep up with the convoluted plot. It may have served the filmmakers better to focus on only the most important elements of le Carre's novel, thereby creating a tighter and more focused film. Maybe it's just not my cup of tea but I remember having the same feeling reading one of le Carre's novels (Tinker, Tailer, Soldier, Spy): too much tedious detail.
Review of The Constant Gardener
