Think carefully before you answer. What would you do for 15 extra years of life? More precisely, what wouldn't you do? In a dystopian 2097, a determined 15-year-old orphan girl, Starla, embarks on a journey across these once United States, to The Great Exchange, an opportunity that comes along only once every five years. Shrouded in mystery, The Great Exchange seemingly offers all comers a rare chance at a longer life. Yet the odds are so small – the journey so perilous – you wonder why anyone bothers. But lifespans being what they are these days, they do – and mostly on foot. For Starla – for all the Trekkers, in fact, notwithstanding the many dangers lurking along the way – it will be the journey of a lifetime. A journey of fear and hope, and even love. Most will die. A few will really live.