Calla Cress returns in the second omnibus edition in the best-selling action series.

This digital box set contains the fourth, fifth, and sixth thrillers.

Book 4 - The Storm's Eye: Something strange is brewing in the skies. The weather follows commands from a decades-old, abandoned research facility on an uninhabited island. Calla Cress is about to learn that the answers lie in a journey more terrifying than anything she could've imagined
Book 5 -The Pythagoras Clause: When a horoscope prediction app makes an alarming prediction about Calla's future, and a malicious old enemy uses her past to control the most unimaginable, powerful technology in the world, Calla is forced to confront a dark part of herself she thought she'd dealt with.
Book 6- The Beale Ciphers: Fact: Two hundred years ago, Thomas J. Beale hid a treasure and wrote a cipher that has been unbreakable until today... that is until Calla Cress starts to read it. Now, some secrets are too dangerous to know, even for Calla.

Each book in the Decrypter series can be read as a standalone novel, but the series is best enjoyed in order. The novels are fast-paced, action-adventures steeped in history, espionage, and cyber defense in a world evermore digitally dependent. The books explore a world where technology and science are at the forefront of humanity.