Initially “Fermat’s Room” looked like an interesting film. An uncommon story about mathematicians who are invited to solve some “enigma” at a mysterious meeting. The result is less interesting. The four end up in a room having to solve “enigmas” that cannot be too hard the the super-mathematicians that are in the room. Each riddle has a time limit and thus the tension is built. Within that process and irritating amount of whodonnit-shifting-plots are rattled off making the situation more and more incredible. “Fermat’s Room” is another of these films with a nice idea, but poor execution.