1999. A group of archaeologists are excavating a Bronze Age burial site in the grounds of Trusloe Hall, a minor stately home in Wiltshire. Excited that their dig is being filmed for a TV documentary, the group are camping onsite and having the time of their lives. In the blink of an eye, one of the party disappears: a young woman called Nazma Kirmani. An extensive police investigation fails to find any trace of her, and the case goes cold for over 20 years. 2020. When a chance discovery presents new evidence into Nazma's disappearance, DI Lockyer and DC Gemma Broad are put on the case. Did Nazma intend to disappear, or was she taken? Did she walk out on her life, or was she murdered? Lockyer must see past the upheavals in his own life to find out the truth for her desperate family.