Writer and broadcaster Steve Backshall embarks on one of his most dramatic expeditions ever. His mission is to ascend one of Venezuela's Tepui - an ancient, table-top mountain. With an elite team of rock climbers, Steve attempts the first ascent of an unclimbed wall on a remote Tepui to search for wildlife on the summit. But nobody could have predicted what would happen, nor the kinds of decisions they'd be forced to make. A white-knuckle ride from the start, the team encounter river rapids and hazardous wildlife, and survive a close shave with a rickety biplane.