"Los Ultimos Dias" is an excellent offering in the post apocalyptic sci- fi sub genre, in the best tradition of films like "The Road" and "Blindness". The story has a simple premise: what if, one day, for unknown reasons humans are unable to survive out in the open? "Los Ultimos Dias" tackles this premise head on and cleverly plays out the consequences of how humanity would deal with this problem, how would it move about, how would it find food, etc. The acting is solid throughout, as is the cinematography and the special effects, which were never unconvincing or distracting. The story itself is very well told, nicely paced, and never stretches believability. I'd also like to mention the wonderful musical score that beautifully complemented the visuals. This was an engaging, intelligent, and beautiful film that I can't wait to watch again.