When a travel writer is stuck on home soil in the middle of a pandemic he meets Kris Rodgers, one of Britain's eminent metal detectorists. Dipping a toe in the hobby, Nigel quickly finds himself swept up in the world beneath the surface. Above the ground are a cast of fascinating and passionate people who open Nigel's eyes to a subterranean world of treasure and stories that bring the history of the island to life. Scouring the country from Cornwall to Scotland in search of treasure and the best detectorists, Nigel finds himself more immersed in the culture than he bargained for and makes his own personal journey from cynicism to obsession in his trail through the heartlands of metal detecting.