Rowan Williams has described him as an “inspiration”. Thom Yorke of Radiohead calls him “truly mental”. Scotland’s first Professor of Human Ecology, Alastair McIntosh is one of our most engaging thinkers, activists and writers. For his new book, he returned to his birthplace, battling the elements to walk the length of Lewis and Harris. In his own words, “too pagan for the Christians and too Christian for the pagans”, he playfully teases out the islands’ contradictions.