Tanta and Cole may have stopped the mass murder of InTech's residents, but the cost was severe. Despite their efforts, Harlow 2.0 - the update to InTech's mind-based operating system - fed out. Now its citizens are compliant zombies, and Tanta and her crew are trapped underground. All except for Fliss, who has no system to update. She alone can go outside, and it's Fliss the crew are relying on to help get them out. For only then can they dismantle the damage Harlow 2.0 has done. If Tanta, Cole and InTech's residents are to truly be free, it needs to be destroyed. But Tanta knows that task will put her on a collision course with the corporation that raised her, her oldest friends, and the woman who was once her soulmate. And this last mission might ask more of her than she's able to give.

Tanta has trained all her young life for this. Her very first mission is a code red: to take her team into the unaffiliated zone just outside InTech's borders and retrieve a stolen hard drive. It should have been quick and simple, but a surprise attack kills two of her colleagues and Tanta barely makes it home alive.

When a bomb goes off at InTech HQ, everything changes for Tanta's corporation. Order becomes disorder. Safety becomes danger. Calm becomes chaos. Tanta is tasked with getting to the bottom of the attack before violence and unrest overtake the city. But even though the evidence points towards rival corporation Thoughtfront, Tanta can't shake the feeling that she's missing something. There's a dark secret at the heart of the case, one that will reveal more about her own corporation than Tanta would like. And the closer Tanta gets to the mystery, the more she comes to realise something terrible: Sometimes facing the truth can be the hardest thing of all.