Dougal Haston was born on the outskirts of Edinburgh in 1940. He was one of Britain's leading mountaineers and a controversial but compelling figure in climbing history. After landmark ascents in Scotland, Haston became internationally famous following his climbs on the Eiger, Annapurna, Everest and Mount McKinley (Denali). Away from climbing, Haston, known for a rock and roll lifestyle, centred on the infamous Club Vagabond in Leysin. He has often been depicted as loner, one who said: 'For me, it is hard to have a friend who is not a climber. He needs to have shared the many close-to-death experiences, and not have panicked; backs one up through trouble, and is not jealous of success. On this basis, I have few friends.' Haston served 60 days in prison for causing death by driving in 1965. Chris Bonington said of him; 'Dougal Haston was not only one of Britain's most outstanding mountaineers; he was the closest to being a cult figure,' and Haston was described by Ed Douglas as 'Bonington's secret weapon, selfish and often absent lower down the mountain, but utterly determined when it came to a summit push'. Calculated Risk was written shortly before Haston's death in 1977, and published posthumously. Haston died aged only 37 in an avalanche while skiing above Leysin - an accident strangely foretold in his novel. His obituary made it into the national newspapers, though his grave was marked only by a numbered wooden cross in a cemetery in Leysin.