當一名護士同事在神秘的情況下死亡后，兩名巡回護士必須撥開醫院里重重秘密迷宮，才能揭露兇手。

　　丹麥懸疑犯罪片，該片刷新丹麥國產片票房紀錄，是系列電影《懸案密碼》的第四部，也是最終章，《懸案密碼》系列改編自丹麥小說家尤西·阿德勒-奧爾森（JussiAdler-Olsen）的同名小說，

　　夜深人靜之時，年輕女子瑞切爾（Anessa Ramsey 飾）和艾莉莎（Hannah Bryan 飾）突然遭到神秘之人的襲擊和綁架。當她們清醒過來后，發現自己正被綁在一座谷倉中，戴著面具的恐怖男子為她們舉行邪氣逼人的儀式。另一方面，受債務困擾的男人本（AJ Bowen 飾）聯合女友艾米（卡瑟琳·蘭道夫 Katherine Randolph 飾）、弟弟湯米（安德魯·布瑞蘭 Andrew Breland 飾）以及陌生男人保羅（Sonny Marinelli 飾）策劃綁架了富有商人瑞恩·海登（詹姆斯·巴茲 James Bartz 飾）的女兒，并索取高達兩百萬美元的贖金。　　正當本和保羅眾人為了贖金起整治的時候，死里逃生的瑞切爾突然出現，隨之而來的還有殘忍的春之祭殺人魔……

　　Anna is stuck: she's approaching 30, living like a hermit in her mum's garden shed and wondering why the suffragettes ever bothered. She spends her days making videos using her thumbs as actors - thumbs that bicker about things like whether Yogi Bear is a moral or existential nihilist. But Anna doesn't show these videos to anyone and no one knows what they are for. A week before her birthday her Mum serves her an ultimatum - she needs to move out of the shed, get a haircut that doesn't put her gender in question and stop dressing like a homeless teenager. Naturally, Anna tells her Mum to "back the f-off". However, when her school friend comes to visit, Anna's self-imposed isolation becomes impossible to maintain. Soon she is entangled with a troubled eight year old boy obsessed with Westerns, and the local estate agent whose awkward interpersonal skills continually undermine his attempts to seduce her.