C.J. Carella wrote these five books in a long time and at that time the fans were waiting for the next book all the time. This is not the matter here because all the five parts of the book are now available in one single book. So the fun will continue till the last line of the series. Queen of Blood and Shadows and Twilight Templar are other books with pure fun attached, written by the same author.
Narration will be different in those books because this book is narrated by the legendary narrator i.e Guy Williams. The aliens were coming to the human world and quite tragically the humans never saw this coming. When the aliens approached the sky of the human world, all the humans could do was watch the destruction that has fallen down on them.
Within no time, half of the human race was eradicated and the remaining half was waiting for its imminent death. Then the new USA emerged on the face of the world that had the alien technology to fight against its enemies and the deadliest force in the world i.e the Warp Marine Corps. With the help of this special force and alien technology, the country became able to fight against the invading aliens and it was time to pay the enemy in the same coin.
Of course, the enemy was not retreating but it finally met its match in the human world. Deadly fights on the ground and in the air are seen and the aliens too get the taste of death finally at the hands of humans who were considered weak at first.