哈利（丹尼尔·雷德克里夫）即将在霍格沃兹渡过第三个年头，此时在阿兹塔班却传出恶棍小天狼星（加里·奥德曼）越狱的消息。据说小天狼星正是背叛哈利父母的好友，他的教父，而这次小天狼星越狱似乎正是为了找他。哈利的心里悄悄的滋生了为父母报仇的想法，期待着小天狼星的出现。
　　新来的魔法老师卢平（大卫·休里斯）有着桀骜不驯的个性，与哈利关系很好，教了哈利许多实用的黑魔法防御知识。而此时在他的魔法地图上却出现了一个神秘人物，虫尾巴。偶然的机会下，在尖叫棚屋里集齐了哈利父亲当年的所有好友，卢平、虫尾巴、小天狼星，哈利的魔杖直指向小天狼星，但他发现那罪犯看他的眼神里充满了疼爱……

　　Can't say too much without giving crucial elements away. Just saw this at a screening in Boston and thought it was one of the more clever independent films I've seen in the past two years. Any cinema buffs, sci-fi fans, or documentary-lovers would find this a very inventive, well-executed, and highly entertaining piece. It seems like it would be unforgivable of any fan of Werner Herzog's to not see this film. You don't need to be a fan of his films to thoroughly enjoy this doc though. I have never seen one of his films before, but I went right out and rented two of them after seeing this film. Great cinematography, fantastic drama, some laughs, and some pretty terrifying footage that you won't believe you just saw!

　　俄勒冈的汤姆（戴克斯•夏普德 Dax Shepard 饰）、杰瑞（马修•里沃德 Matthew Lillard 饰）、丹（赛斯•格林 Seth Green 饰）和比利是四个从小玩到大，喜好冒险和刺激的朋友，二十岁那年，比利出门远行告别了三人。十年以后，比利在旅行中因事故身亡，三个老伙计再度在葬礼上重逢，三十而立的的三人生活各有烦恼，他们回到童年时的树屋，发现了比利留给他们的“藏宝图”，比利美妙的旅行经历吸引着他们，三人决定马上按图出行，完成童年的梦。一路上，三人遇见了视丹为自己孩子的巨熊、在山谷中种植囤积大量大麻的暴徒二人组，还有自诩为自然人的两个美丽姑娘。一路上的冒险经历，使三人对人生有了全新的认识……