Late to mention this, but Book of the Week on Radio 4 is On Thin Ice: An Explorer’s Memoir of Siberia, Surveillance and Survival by Charlie Walker (Duckworth, £16.99). In early 2022, Walker, a British explorer and author specialising in long-distance expeditions, set out to hike 600 miles along Siberia’s frozen rivers. His aim was to reach remote settlements of the indigenous Sakha and Evenki peoples and witness their way of life in the harsh northern winter. But on February 24, three days after he arrived in Yakutsk, Russia invaded Ukraine. Walker completed his trek, but along the way he was accused of spying and spent four weeks in prison. On Thin Ice “juxtaposes the harsh beauty of a Siberian winter with a thriller-like series of events that exposes the dark heart of Putin’s propaganda machine. It is both the extraordinary record of one man’s walk… and a powerful insight into a deeply troubled – and troubling – nation.”