'He was met by a million stars against the night sky, a sight so beautiful it made him weep. If he were to die tonight there was no better view.'

When Detectives David Stone and Frankie Oliver are called to Kielder Observatory to investigate skeletal remains found inside a barrel dumped in the water, they learn they're dealing with a death that happened decades ago.

But days later when another body turns up floating in Kielder Water, they realise this case is perhaps not as cold as they think.

With Stone taking on the first body in Northumberland, Frankie has to fly to Iceland to investigate the second - but how are these two deaths connected? And how do they tie in to the murder of Frankie's sister all those years ago?