This is the second of the TimeRiders series and just as good at the first. I sat up late to finish and read it in one day which is something I don't do very often with a print book. 
 I love the characters and the concept of the plot, and the way the author handles the changes in the times lines. The ongoing angst in regard to the consequences of travelling through time is something I very much appreciate to - that it's not just a 'cool, we can time travel' but the fact that it will come at a price. 
 I must admit to reading the last paragraph first (it's a bad habit) and going yes! when I'd guessed the identity of Foster correctly in the last book. 
 This is one of my favourite ongoing series and I'm now hanging out for the next one. Robin Hood!!!!