The Calla Cress Technothriller Series:
Book 1: The Decrypter Secret of the Lost Manuscript
Book 2: The Decrypter and the Mind Hacker
Book 3: The Decrypter: Digital Eyes Only
Book 4: The Decrypter : The Storm’s Eye (Coming Autumn 2017)
Book 5: The Decrypter: The Pythagoras App (Coming End 2017)
Other:
You can find more on the books here:
http://www.rosesandy.com/books.html