The border troops of the Ming Dynasty put raw rice in a pot and cooked up a shocking old case. Chen Huowang, a member of the Huotou Army, was falsely accused of deserting three years ago. He cut off his fingers in public and hid in the kitchen. During the day, he cooked on the fire, and at night, he dug out evidence from the ashes and dug out the truth from the layers of the iron pot. Until Liu Ruyan, a member of the Jinyiwei family, investigated the same military ration case for his father's revenge, the two formed an alliance in the smoke and fire. One uses the stove fire to calculate people's hearts, and the other uses the blade to open the blood path. They discovered that the batch of life-saving rations was artificially delayed for three days, resulting in three thousand soldiers starving to death on the battlefield. And all clues point to an erased timeline. Zhao Tieguo's account book, Sun Banxian's wax seal sample, and the mute Xiao Man's secret account are three pieces of ironclad evidence that are intertwined. When Zheng Baihu set fire to the camp to kill his wife, Chen Huowang pulled out the last charred bone from the stove - the remains of the grain officer. The five pictures determined the world, and the Huotou Army overturned the entire military town. But behind the truth, there is a pair of invisible hands that are taking the blame to the capital. Chen Huowang and Liu Ruyan must send the evidence to the Forbidden City before the next fire. Otherwise, they will be the next handful of ashes.