Tiffany "Rex" Simpson has always dreamed of going to space, and her "doctored" application lands her in NASA's ultra-competitive astronaut training program. In over her head, can this Florida girl rely on her quick wits, moxie and determination to get through training and into the cosmos before she blows her cover?

A courageous and athletic teenager, Kayara dreams that she is destined to be the first female to break into the league of Chasquis - the official messengers of the Incan empire. As she learns what it takes to be a Chasqui along with its challenges, she tackles every mission she gets and discovers the ancient stories of her land and her people.