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There was an undercurrent surging in the prosperous Tang Dynasty. During the Ministry of Household Recruitment examination, the mathematical genius Shen Qingwan disguised herself as a man (or under special circumstances) and made a stunning appearance. She used a unique algorithm to solve the mystery of water transport loss that had troubled the court for many years, and became famous in one fell swoop. However, talent leads to jealousy and murderous intent, and she accidentally gets involved in a shocking conspiracy against the "Mountains and Rivers Map". In order to protect Qingwan Zhou, the cold-faced master Pei Ji did not hesitate to disguise himself as a libertine and go deep into the tiger's den alone. He was even willing to bear the reputation of a "murderer" to lure away powerful enemies. The two broke up several times amid misunderstandings and suspicions, and regained trust on the edge of life and death. From the Yellow River flood fight to the palace rebellion, from the bloody battle in the abandoned arsenal to the rainy night pursuit, they cooperated internally and externally, peeled off cocoons, and finally exposed the heinous crime of a powerful group headed by the Minister of Industry who secretly manufactured crossbows with the intention of conspiracy. After going through the test of life and death, Pei Ji was poisoned and his life was hanging by a thread. Shen Qingwan vowed to die to find the medicine. The novel combines sophisticated mathematical deductions, gripping suspenseful investigation, and heart-wrenching feelings about family and country. It tells the legendary story of a pair of wise and courageous lovers who work together to protect the peace of the Tang Dynasty and the people in the turbulent court and rivers and lakes.