Forgotten City Series by Michael Ford

Thirteen years ago, the world ended. A deadly chemical called Waste began to spread across the globe, leaving devastation in its wake. Millions died. Cities fell into chaos. Anything the Waste didn’t kill, it mutated into threatening new forms.Kobi has always believed he and his dad were the only survivors. But when his dad goes missing, Kobi follows his trail—and discovers a conspiracy even deadlier than the Waste itself.

Everything Kobi once believed was a lie. Not only are there other survivors of the Waste that devastated the world thirteen years ago, but beyond the wasteland of Old Seattle lies a gleaming new city where thousands are desperate for a cure.To put an end to the Waste—and bring justice to those responsible–Kobi and his new friends will have to return to the heart of Old Seattle, where the outbreak began. It’s a dangerous journey. But Kobi knows what lies ahead. And he’s ready to fight.