May: Lewis Trilogy. The Lewis Man

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. But this islander, Tormod Macdonald - now an elderly man suffering from dementia - has always claimed to be an only child. When Tormod's family approach Fin Macleod for help, Fin feels duty-bound to solve the mystery.