双警探被迫重启六年前未结悬案，在史前人类洞穴的献祭仪式与现代财阀的石油黑幕间，与重出江湖的连环杀手展开「文明进化论」式生死博弈——当少女尸骸上的尼安德特人齿痕，指向一场跨越万年的道德崩坏

After her bittersweet success in series one, Karen has been promoted to Detective Inspector and seemingly given the authority she has long been fighti