takes us on a journey into the worlds beneath our feet. From the ice-blue depths of Greenland's glaciers, to the underground networks by which trees communicate, from Bronze Age burial chambers to the rock art of remote Arctic sea-caves, this is a deep-time voyage into the planet's past and future. Global in its geography, gripping in its voice and haunting in its implications.
Macfarlane, a winner of the Hay Festival Prose Medal, is the author of Mountains of the Mind, The Wild Places, The Old Ways, Landmarks and The Lost Words, co-created with Jackie Morris.
Horatio Clare’s latest books are The Light in the Dark and Something of his Art: Walking to Lübeck with JS Bach – Hay Festival’s Book of the Month for December 2018.