Forgotten city

"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"--Amazon.com.