The Change Series by James Bradley

It's a decade from now and the human race is dying. Plants, animals and humans have been infected by spores from space and become part of a vast alien intelligence.When 16-year-old Callie discovers her little sister Gracie has been infected, she flees with Gracie to the Zone to avoid termination by the ruthless officers of Quarantine. What Callie finds in the Zone will alter her irrevocably, and send her on a journey to the stars and beyond.

"tautly written [with a] breakneck speed narrative and a strong, kick-ass female protagonist." The Sun HeraldBOOK 2 IN THE CHANGE TRILOGY, SEQUEL TO THE SILENT INVASIONCallie risked everything to get her little sister Gracie to the safety of the Zone. But Matt, the boy she loves, has been killed by Quarantine and Gracie has been absorbed into the Change. Now Callie must learn to survive in the alien landscape of the Zone, a place where the Change is everywhere, and nothing is what it seems... more"tautly written [with a] breakneck speed narrative and a strong, kick-ass female protagonist." The Sun HeraldBOOK 2 IN THE CHANGE TRILOGY, SEQUEL TO THE SILENT INVASIONCallie risked everything to get her little sister Gracie to the safety of the Zone. But Matt, the boy she loves, has been killed by Quarantine and Gracie has been absorbed into the Change. Now Callie must learn to survive in the alien landscape of the Zone, a place where the Change is everywhere, and nothing is what it seems. That is, until she stumbles on a secret from her past that may hold the key to defeating the Change. Hunted and alone, she finds refuge in the most unexpected of places. Only to find she is in more danger than ever. PRAISE FOR THE SILENT INVASION"...a vivid novel that will leave readers itching for the next instalment" Sydney Morning Herald less