Dark Vengeance by Shelley Russell Nolan

Victory comes at a cost.

In the aftermath of the battle to free Brimfield from the control of a madman, Jackson Kyle, Captain of the Ward, is focused on protecting the humans under his charge. But not all his enemies have been vanquished.

Forced to flee, Jackson and his wardens seek a safe place to create more of the cure for the freak virus. But not everyone wants to see an end to all freaks. As hidden agendas surface, Jackson is ripped from those he trusts, putting the future of humankind at stake.

With his allies scattered, and his own kind turning against him, it will take everything Jackson has to win this fight. But if he loses his life … the cure dies with him.