Evil Star is by Anthony Horowitz. The second book in The Gatekeepers series. Matt thought everything was over once he closed Raven's Gate, but now it appears an evil group is trying to open another gate in Peru. Matt and Richard travel to Peru to stop them and when they are separated by an ambush, Matt meets a young Peruvian boy he recognizes as another of the five. He and Pedro must join together with a group of ancient Incan warriors to stop the second gate from opening.
Ratings: 7th grade - 8 out of 10 - V (violence).