Sam, a brilliant computer hacker seeking a better life, always seems to make the wrong choices, even under the watchful eye of his probation officer, Harry. Now, barred from using the Internet and stuck working fast food with his best friend and fellow hacker, Stanley, Sam poses as a Postal Worker, stealing people's mail to make ends meet. Until one letter changes everything. Written by the beautiful Josie to her dead husband, a Marine killed in Afghanistan, the heart-wrenching missive wakes something in Sam. Desperate to become worthy of such love, he begins following Josie and stealing more letters, until finally finding the courage to introduce himself. As Sam and Josie grow closer, she warms to the possibility of a new life as he's reminded of the values left behind in childhood. But fate shows its hand when Sam's past catches up with him in the form of an aggressive FBI agent and missing Bitcoins. When Josie discovers the truth, she must decide if the betrayal will force her back...

遥想上一次惊心动魄的冒险已经远在六年之前，如今的哈罗德（约翰·赵JohnCho饰）和卡玛（卡尔·潘KalPenn饰）也已各自过上安定的生活，哈罗德成为了华尔街一名有为商人并已结婚，而卡玛还依旧住在当年和哈罗德合租的旧公寓。眼看圣诞将至，哈罗德的父亲和岳父决定前来一起过节，岳父还特地带来了他最钟意的一棵圣诞树。一天，卡玛收到一个写着哈罗德名字的包裹，他决意上门将其交给哈罗德，然而意想不到的事发生了，两人竟然无意中烧毁了岳父的圣诞树，为了在岳父发现之前找到一棵以假乱真的替代品，他们再次走上纽约街头，不过依二人的一贯作风，这次的寻找圣诞树之旅，恐怕又要发展成一次怪事不断高潮迭起的疯狂冒险了……本片为系列喜剧《寻堡奇遇》第三集。