Even if the viewer has seen the previous two movies in the "Baztan Trilogy," this movie is still an overlong and convoluted story. Offering to the Storm is based on a novel, and while this kind of complexity is likely to work in book form, to try and include that level of detail in a movie results in a two-hour-and-eighteen-minute movie that constantly feels like it should be about 45 minutes shorter, at least. The plot includes, but isn't limited to: hippie cults that turned messianic and deadly as their followers (the ones who weren't killed) grew old and rich and successful, mysticism, a demon called "Inguma," the Church, infanticide, suicide, death by walnuts, the thorny legal issues involved in trying to exhume infant corpses from graves, and why you should never use old explosives under any circumstances. If that sounds like a lot, it's because it is.
It's a textbook case of a movie trying to "kitchen sink" its way through a story, with plenty of gory violence included when the complexity of the story proves tedious. On top of that, somehow the lead character has time to have an affair while her husband and daughter, conveniently enough, must leave the country, and this affair seems altogether pointless and forced. Without the excess, repetition, and at least three of the subplots, Offering to the Storm might have been an enjoyable movie on its own terms, whether or not one had watched the previous two movies in the trilogy or not. Unfortunately, that's not the case.