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　　In “Muzzle: City of Wolves,” Jake Rosser (Eckhart), haunted by PTSD from his days as a K-9 officer, endeavors to lead a peaceful life with his family and retired K-9 companion, Socks. But the tranquility quickly dissolves when a ruthless gang targets them in a brutal attack. Determined to protect his loved ones, Jake and his new K-9 partner Argos delve into a violent underbelly of crime where Jake confronts corrupt officials, uncovers a perilous drug trafficking ring and battles his own inner demons.

　　British Army radiation drills at a remote Scottish base attract a subterranean, radioactive entity of unknown nature that vanishes, leaving two severely radiation-burned soldiers... and a "bottomless" crack in the earth. Others who meet the thing in the night suffer likewise, and with increasing severity; it seems to be able to "absorb" radiation from any source, growing bigger and bigger. What is it?? How do you destroy a thing that "feeds" on energy?

1916年，第一次世界大戰在西線激烈進行，約克郡拉姆斯登的合唱協會失去了大部分男性成員，他們都應征入伍了。雄心勃勃的委員會決心繼續前行，決定招募本地的年輕男性來填補隊伍空缺。同時，他們還必須聘請一位新的合唱指揮，最有希望的人選是亨利·格思里博士（拉爾夫·費因斯 飾）——一個意志堅定、毫不妥協、剛從德國音樂生涯歸來的男人。隨著征兵通知陸續送達，全社區的人逐漸意識到，在戰爭摧毀一切的混亂中，最有力的回應就是：一起奏響音樂。

在本作品中，人們聽了從某個卡式錄音帶中流淌出的“某個旋律”后，自己也漸漸哼唱起了那個旋律，被卷入了不可思議的事件中。