危险物质突发泄漏！24小时后危及香港全城。如何及时阻止这场末日灾难，专家范伟立（刘德华饰）与Cecilia（莫文蔚饰）各执一词。同时，消防队长黎杰峰（白宇饰）和队友已奉命奔赴未知前线。随着末日的逼近，富商的黑色利益链也逐渐浮出水面，独享财富却要平摊灾难，这次危机究竟要如何才能化解？

December 1924, Karl Denke fails to smite Vincenz Olivier with a pickaxe. He would have been his 31st victim. The film thus reconstructs the mind, motivation, and psyche of its main character in intense dialog between him and the inspector.