‘Eternal War‘ by Alex Scarrow is the third in the TimeRider series. The basic storyline is three teenagers who have been saved from death are transported to a hub where time replays itself every 2/3 (i cant remember!) days, before and after 9/11.A bit like the tv show ‘Primeval’, each book takes place in a different timeline. If something changes history, then a time wave occurs and changes the present. The three then have to figure out how to change it back, by going back in time.I really enjoyed the first three books in the series; however I did read them all in one go so by the 3rd it was a bit too much. The books do jump around a lot; from the present to the past/future and sometimes different places too. I think it takes some time to be immersed in the book because of this. However, each chapter is clearly defined in time and place so it’s easy to double check you know where/when you are!I think these books are great for YAs who like a bit of action, but aren’t afraid of the sci-fi aspect of the timechanging. There is great character development throughout the books, and I think these books are underrated.The reason I’ve jumped back on the TimeRider ship is because I received the 5th book as a present, so had to read the fourth. And I can’t wait!