A man with no name. An unidentified corpse is recovered from a Lewis peat bog; the only clue to its identity being a DNA sibling match to a local farmer. A man with no memory. But this islander, Tormod Macdonald, now an elderly man suffering from dementia, has always claimed to be an only child. A man with no choice. When Tormod's family approach Fin Macleod for help, Fin feels duty-bound to solve the mystery.