As the Ancients collect those with 'potential' and Kaiahive gear up for an all-out assault that will lead to devastating retaliation, time is running out.

But who can turn the tide? Brice, prisoner of the Ancients and all alone? Keelin, reunited with her NeoGen sisters but still inferior to the company's Eves? Deva, lattice-less and adrift in the city beneath? Or Ryann, struggling to hold the Collective secure as the company bears down?

As futile as it appears, they must fight on. Because if they give up, it's the end of humanity.

System Purge is the final book in the sci-fi action/adventure series ShadowTech.