Runner 13

It's the ultimate challenge: a multi-day race across the Sahara, with only the supplies you can carry on your back.And Adri couldn't be more 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.It takes a while for Adri to realise that something isn't right. After all, in an environment this inhospitable, 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...