In Horror House, when the power goes out all over town, Zac's SpyPad intercepts a message from BIG! The address in the message leads him to a creepy house that's full of surprises. Will Zac get to the bottom of BIG's plans? Or has he walked into a trap? Then, in Thrill Ride, there's a sinister invention at Shark Park that's about to be unleashed! Zac's spy senses are on high-alert. He must ride the scariest roller-coaster, stop the invention and save the world ...