Skara Brae, Orkney, during the Neolithic period. The sun is dying, crops are failing and the local inhabitants fear that the end of the world is near. When a strange boy appears from nowhere, dressed in an odd silver suit - his 'silver skin' - the community is thrown into confusion. Who is he, where is he from, and why has he come? Is he a selkie or seal person, a mythical being believed to have magical powers?
For Cait, herself an outsider...