The Night of the Scorpion
Lore of the Incas, the Nazca Lines, the Old Ones ('the first great force of evil') and adventure where good takes on evil (yet again!); the excitement is boundless. It's a wonder super-psychic Martin and his journalist friend Richard manage to contain themselves intact to the end, but then young Martin is One Of The Five!! I daresay you've got the gist. It'll keep them reading if they want action rather than depth. Upper Junior/Lower Secondary.