***THE INSTANT SUNDAY TIMES BESTSELLER***The explosive new thriller featuring MI6 operative Luke Carlton on his most terrifying mission yet. Deep within the Arctic Circle, three scientists from the UK''s Arctic Research Station trudge through a blizzard in search of shelterThey see a cabin ahead. It appears abandoned. No lights. No snowmobile outside. But as they push open the door, the smell hits them. Rank and foetid: there''s something bad inside. Then movement. A man lies slumped, his face disfigured by livid pustules. Blood runs from his nostrils; his chest glistens blacklyThe team''s medic, Dr Sheila Mackenzie, pushes forward to examine him when the convulsions start. Blood, bile and mucus spray into the air. The doctor knows it''s too late - she''s been contaminated . . . Within hours, a full-scale operation to contain this contagion is underwaySamples are rushed to the laboratories at Porton Down on high alert. What they discover changes everything. Supported by phone and data