This is the fourth installment of the Sanctum series of books, squarely aimed at a pre-teen and young adult audience but a good read for adults too.
For anyone unfamiliar with the series, the Sanctum is a special school created by and run by rich philanthropist Avando. He rescues children from a life on the streets and gives them a second chance at the school where they have the opportunity to have a first class education. But Avando also picks the best of the pupils to help in a covert war against terrorism, using surrogate robot bodies to investigate suspect sites, including rival school Ernest College.
Despite his capture at the end of the previous book, Professor Eric Showden is again the villain of the piece. A former teacher at The Sanctum and pupil at Ernest College, he is aided by a company called The Black Axes to escape. This time both schools are in direct danger of attack and must cooperate to survive. But just how far can they trust each other?
This series is rapidly turning into a must-read cyber thriller. Both schools are now in direct conflict with the terrorists, having to defend against direct attack as well as try to stop their plans, all the time keeping one eye on the other and try to give as little information away as possible. There are some excellent set pieces and the way these are set up - essentially robots battling with martial arts - they are very different from the usual gun-toting fare.
Again the characters come to the fore - Jayden and his friends are once again the core for the Sanctum. Liam takes a very central role at Ernest college and his uncertainty as events unfold make a reassuring counterpoint to the main story line.
Once again I cannot recommend these books enough. I'm very much looking forward to the fifth book in the series and have no doubt it will be another excellent read.