Fed up with bleak headlines of biodiversity loss, acclaimed nature writer Roger Morgan-Grenville sets out on a 1,000-mile walk through a British spring to see whether there are reasons to be hopeful about the natural world. His aim is to match the pace at which the oak leaves emerge, roughly 25 miles north each day. Fighting illness, blizzards and his own ageing body, he visits every main habitat between Lymington and Cape Wrath in an epic eight-week adventure, encountering, over and over again, the kindness of strangers and the inspiring efforts of those fighting heroically for nature. With surprising conclusions throughout, what unfolds is both life-affirming and life-changing.