The newspapers called it The Bad Place. A remote farm out on the Thames estuary, where six children were held captive for two weeks. Five of them got out alive.

That was twenty years ago. Now adults, they meet up annually to hold a candlelit vigil for their friend who died. The only rule is that no-one can talk about what happened the night they escaped. But at this year's event, one of them witnesses a kidnapping. A young girl, Sammi, is bundled into a van in front of their eyes.

Is history repeating itself? Is one of them responsible? Or is someone sending them a twisted message?

DI Sasha Dawson, of Essex Police, is certain that the key to finding Sammi lies in finding out the truth about The Bad Place. But she also knows that with every second she spends trying to unlock the past, the clock ticks down for the missing girl...