Hope's Defiance (The Final Book of The Echo Chronicles)

"You're not as alone as you think."

Five months have passed since the Echo crew was torn apart by betrayal and sacrifice. Trinidad Shepherd and Dalton Stevens are working with the growing rebellion against Vartan Craven, desperate to find intel on the location of the increasingly paranoid and elusive Emperor.

As Craven plans another cruel display of his power, the last cavers of Cave System Echo Night Patrol must race to find the purpose and location of the mysterious Polaris Protocol. Wh...