一桩令人震惊的双尸命案十六年来一直悬而未决，一名警探和一位系谱专家于是联手追捕凶手，试图破解这桩悬案。

艾米莉亚·福克斯 (Emilia Fox) 和英国著名犯罪学家大卫·威尔逊 (David Wilson) 教授调查著名的未破谋杀案。通过访问犯罪现场并重新调查证据，他们试图弄清到底发生了什么。

Using the latest developments in forensic science to uncover new evidence, a specialist team of cold case detectives from South Wales Police are determined to finally get justice for six-year-old Carol Ann Stephens.

Veronica is 30 years old when she disappears. At home in the apartment in Högsbo in Gothenburg, 3-year-old Marcus is waiting for his mother. Today Marcus is 22 and is looking for his father. In the wake of the parents' love story, the mystery grows and discovers a dramatic tangle of events in China, Thailand and Sweden, with disappearances and murders.