Ghosts of Mars

Sierra is pretty excited when she discovers on her fifteenth birthday that her best friend from NASA Space Camp has moved from Australia to live near her in California...but she has no idea just how exciting - and dangerous - things are about to become.

David and Sierra are recruited by NASA for a mission to Mars. A last, desperate attempt to unlock the secrets of Martian civilisation before the planet is destroyed by a giant asteroid. Training to be astronauts and taking the trip to the International Space Station alongside experienced pilots is challenging enough, but time is short and the teenagers will have to undertake the perilous Mars exploration alone. They knew the risks when they accepted the mission - but when their only landing craft is seriously damaged, they have to face the possibility that they may not survive this adventure...

Sierra este destul de entuziasmata cand descopera la a cincisprezecea aniversare ca cea mai buna prietena a ei din NASA Space Camp s-a mutat din Australia pentru a locui langa ea in California ... dar nu are nicio idee cat de interesante - si periculoase - vor deveni lucrurile. David si Sierra sunt recrutati de NASA pentru o misiune pe Marte.