I, Immortal the Series, Book Three, Fire and Ice — Melissa Rutter

They spent years fighting for peace and humanity, years of putting themselves before everything else. This time though, it isn't just about them, this time it is about their son, Caleb. Destroying the ruthless Fallen leader Cornelius should have been the end, but it seems it was only the beginning. A battle may have been won, but the war continues. Can Amelia and Peter stop the destruction of earth and rid the world of evil? If one drop of her blood is spilled, that's it, game over. 100 years of fire followed by 100 years of ice, nothing will survive, they have to do all they can to stop it, to protect the human race once more. While we sleep sound in our beds, they are out there protecting us, only we'll never know it.