Helix: Episode 8 (Kill Switch)

Time is running out.
Olesya and Sophia have one last chance to stop Purity from taking over Europe.
But the Fifth Column are closing on them and they're going to need all the help they can get.
The hardest part won't be infiltrating a fortified Prague.
It will be getting inside Purity's most powerful weapon: the Spear.
What readers are saying:
----- "I'm completely blown away by this series, one of the most amazing action stories I've read."
----- "Helix is everything I love about action and adventure novels: spies, gadgets, fights, escapes, characters you care about, and a carefully crafted story."
----- "A captivating, action-packed and suspenseful technothriller."
----- "Ambitiously, amazingly addictive. As soon as I finished this I purchased the next episode."
----- "Nathan Farrugia is back, holding his readers hostage for yet another amazing and wild ride. The characters are really brought to life on the page and in the heart."
----- "Absolutely brilliant. I've always compared Farrugia to Matthew Reilly, and with Helix I think he has finally surpassed Reilly."
----- "Helix is a fast-paced, edge-of-your-seat action-packed series guaranteed to please the most adrenaline-craving readers. Farrugia's writing is excellent, you fly through the books. I am totally emotionally invested in all the characters. A must read for all thriller fans, and sci-fi fans looking for a break from outer space."
----- "The author's signature cutting-edge technology, complex plotting, cool gadgets, three-dimensional characters and Hollywood blockbuster-style action sequences are explosively combined in this new series."
----- "This high-octane thriller by Aussie author Nathan Farrugia starts with a bang and ends the same way."
About the author
Nathan M. Farrugia is an Australian technothriller writer, and author of the USA Today bestselling Helix and Fifth Column series. Nathan is known for placing himself in dangerous situations, including climbing rooftops in Russia and being hunted by special forces trackers in the United States. He studies Systema, a little-known martial art and former secret of Russian special forces.
Beyond his army training, Nathan has trained under USMC, SEAL team, Spetsnaz and Defence Intelligence instructors, and the wilderness and tracking skills of the Chiricahua Apache scouts and Australian Aboriginals.
Nathan is currently in Malta, co-writing the sequel to the critically acclaimed video game Metro Exodus by 4A Games.
Also by Nathan M. Farrugia:
Helix #1: Helix
Helix #2: Exile
Helix #3: Interceptor
Helix #4: Anomaly
Helix #5: Inversion
Helix #6: Exclave
Helix #7: Purity
Helix #8: Kill Switch
Helix #9: Countervail
ZERO
The Chimera Vector
The Seraphim Sequence
The Phoenix Variant
The Phoenix Ascent