On Shetland, the launch of an exhibition at The Herring House art gallery is disturbed – a stranger bursts into tears, claiming not to remember who he is or where he comes from. The next day, Inspector Jimmy Perez finds his dead body in a fisherman’s hut.

Initially, it seems to be a straightforward case of suicide – yet this is no desperate act. Instead, it soon becomes clear, this is the work of a cold-blooded killer. As Perez investigates, he finds himself mired in the hidden secrets of a small community. Then another body is found.