**Pre-order the gripping new thriller from the bestselling author of Breathless, based on her own extraordinary ultra-running experience**It’s the ultimate test of endurance: two-hundred-and-fifty miles in the brutal heat of the Sahara, with only the supplies you can carry on your back. Adri is ready. Returning to ultra-running in the wake of a scandal, she needs to prove to herself – and her young son – that she’s a winner. When a fellow runner is badly injured, Adri knows something isn’t right.Yet in a race this extreme, even a dead body can be explained away. But there’s a killer stalking the hot sand. And the problem with running faster than everyone else, is that you’re miles ahead of anyone who can save you... -----PRAISE FOR AMY MCCULLOCH'Amy McCulloch is the queen of the adventure thriller!' - CLAIRE DOUGLAS'Enthralling...She has an eye for edgy and unusual settings....' - SUNDAY TIMES'Chills, thrills and intense suspense...' - CHRIS WHITAKER