Crime writer Peter May has come out of retirement for the second time to revisit his acclaimed Lewis Trilogy – something he vowed never to do. His thrillers, set on the windswept isle in the Hebrides – The Blackhouse, The Lewis Man and The Chessmen – propelled him into the big time, helping build global sales of more than 15 million copies.

They also made the detective at the heart of the novels, Fin Macleod, one of his most cherished…