The Wager and the Bear by John Ironmonger

When young idealist Tom publicly humiliates politician Monty in a Cornish pub, it sparks a simmering feud that cascades through their intertwined lives. The consequences of their argument, and the deadly wager they strike, will cascade down the decades. Years later, they find themselves a long way from St Piran onto a colossal iceberg drifting south away from Greenland, their only companion a starving polar bear. This is a heart-stopping tale of anger, tragedy, and enduring love, cast against the long unfolding backdrop of an irreversible global crisis.

John Ironmonger was born and grew up in East Africa and is now based in Cheshire. He has a doctorate in zoology, and was once an expert on freshwater leeches. He is the author of The Good Zoo Guide and the novels The Notable Brain of Maximilian Ponder (shortlisted for the 2012 Costa First Novel Prize and the Guardian's Not the Booker Prize), The Coincidence Authority and The Whale at the End of the World (an international bestseller). He has also been part of a world record team for speed reading Shakespeare, has driven across the Sahara in a GBP100 banger, and once met Jared Diamond in a forest in the middle of Sumatra.