Astrid Nielsen, works in the library of the judicial police. Suffering from Asperger's syndrome, however, she has an incredible memory, so she is very useful in analyzing the files for ongoing investigations. The district commander, having noticed this ability, decides to use it to the fullest, entrusting her with very complex investigations which have remained unsolved to date. In addition, also to reciprocate, he will try to help Astrid on the behavioral side, in order to provide mutual help.

行游乐师伊戈纳西奥·卡里略（马西亚诺·马丁内斯 Marciano Martínez 饰）在妻子去世后决定出发寻找自己的老师格拉大师，将一架长着两只黑色犄角的“魔鬼”手风琴交还给他。少年富民·莫拉莱斯（尤尔·努内兹 Yull Núñez 饰）执意跟随伊戈纳西奥，要向他学习拉手风琴的技艺，但固执的伊戈纳西奥不肯，还说富民缺乏天赋。二人一驴在南美的广袤平原和嶙峋山脉间穿行，缺乏旅费的时候伊戈纳西奥就在过往小镇的音乐节上跟人斗琴，演奏挣钱。在一次表演中，富民发现了自己的打鼓技能，并得到某神秘部落蜥蜴血的洗礼。富民不满伊戈纳西奥的傲慢做派，赌气离去，却在附近小镇瓜西拉岛人音乐节上发现了“魔鬼手风琴”，而伊戈纳西奥则不见踪影……　　本片获嘎纳电影节罗马城市奖，哥伦比亚波哥大电影节最佳哥伦比亚电影奖及最佳导演奖，卡塔赫纳电影节最佳哥伦比亚电影奖，以及圣巴巴拉国际电影节最佳西班牙语电影奖。