“It is we amateur runners who are likeliest to turn to audiobooks as a training accompaniment, I suspect. Far from wanting to ‘listen to our breathing’ to achieve an optimum split time, we’d rather drown it out with something more interesting that will distract our minds from the miles of unrun road ahead. As I found with The Fear Index, a cliffhanging chapter ending will force the most reluctant runner into his or her trainers again, not for the fun of training but simply to find out what happens next.”