Blood in the Ashes — Chris Morphew

Things are getting bad in Phoenix. Luke's dad is trapped on the outside and cut off from all contact. Jordan is having frightening visions of things that haven't happened yet. And Peter is slowly losing his grip on reality -- and his temper. But the worst is yet to come. All three are being tracked by an enemy who could paralyze them at any moment. And deep under Phoenix, they will uncover a secret that changes everything. The clock is still ticking. Published previously as two books, Mutation and Underground.