Four female detectives specialize in reopening cold cases. Their limits are put to the test in the face of brutal truths and twisted humanity.
Luo Yingwei (Li Yuan) is the talkative team lead of three young detectives in Pingling City. Cai Wenxin (Kira Shi Shi) is known as the queen of gossip, Xia Luoyang (Pu Tao) is beautiful and determined while Feng Yi (Xu Yuan) brings up the rear as the quiet and bookish member of the group. Bringing the four ladies together is like a disaster waiting to happen, yet they manage to prove themselves time and again. With the help of Cai Wenxin's older brother Cai Wenfei (Wang Yu) and under the guidance of their superiors in the police force, this small team of four work together in each case and ultimately go head to head with a massive drug syndicate.