Since they met, Emelda and Kane have battled shadow organizations, cartel assassins, and monsters both human and inhuman.
Now, they face a global threat unlike any before.
When Kane confronts a mutated beast with powers that dwarf his own, the unthinkable happens-leaving Emelda to doubt everything she has ever known.
With time running out and enemies closing in, new allies and old adversaries converge in a desperate final stand. But in a world where science has twisted nature's laws, the fate of humanity now rests solely on this "pack of two."