Dylan O'Connor is in trouble again. While riding his bike home after dark, he has a run-in with a truck but doesn't give it a second thought until police show up at his door the next day. CCTV cameras put Dylan at the scene of a crime, and when the police question him, Dylan realizes he was an inadvertent witness. But he doesn't tell them the driver of the truck was Jeff Walker, a nasty piece of work. Dylan knows it's in his best interests to keep his mouth shut. Then he starts getting stalked by Jeff's weirdo sidekick, Eliot Barnes, a classmate of Dylan's. Is Eliot trying to protect Dylan, or is he making sure he stays silent?
Medusa's Scream is a thrill-ride that hurtles a train through an out-of-service gold mine in the Fraser Valley. Chase can't believe his luck when he lands a summer job in the food truck outside the ride's entrance. But then he notices strange things happening at the old mine. Chase starts to piece things together, and soon his life is threatened by a villain even scarier than the snake-headed Medusa of myth.
Thirteen-year-old Chris and his family are setting up a bungee jump in his backyard. It's a real large-scale bungee jump off a bridge that connects his backyard to a small island owned by his family. Not only is it going to be the coolest attraction around, but it also provides Chris with an opportunity to watch a real engineer in action. Chris would be excited about it if things didn't keep going wrong. The rumors of hauntings on the island, once the site of a hospital for children with leprosy, are getting out of control. And there are mysterious mishaps on the bridge. Chris worries that all of these problems will keep customers away. And if the bungee jump isn't a success, his family will lose everything.
Sam and Annabel are on vacation with Annabel's parents in Italy. While visiting the small hilltop town of Civita, they hear rumors of looted gold from World War II buried somewhere in the town's network of underground tunnels and caves. Once again the two friends cross paths with their old nemesis, Humphrey Battleford, but he is not the only one in pursuit of the gold. An intimidating man named Kurt, the grandson of a ruthless Nazi, is also snooping around. After Annabel is kidnapped, Sam must solve the mystery of the hidden treasure to save his friend. This is the fourth mystery featuring Sam and Annabel, after Stolen, Bones and Lost.
Eric and Chris are avid geocachers who stumble into a very strange search for a series of geocaches. At first they are merely curious, but as the stakes rise and the challenges become more trying, the boys get truly hooked. Convinced they are indeed on the trail of treasure, they become consumed with the search, and though their quest tests their strength, intelligence, courage and even their friendship, they don't give up.
Joe and his friend Skip are enjoying the thrill of the Big Dip, a famous rollercoaster, until they learn the old man in front of them has been shot. The old man mutters with his dying breath something about getting a Margaret Rose to the police. Joe leaves the crime scene to get on with his life. But someone is desperate for the Margaret Rose and thinks Joe has it. When his sister is kidnapped, Joe is in a race against time to solve the puzzle.
Dan Hogg is thrilled when his uncle offers him some work at a food fair, because he wants money to hire a professional trainer to help him with his scrawny physique. His excitement vanishes when he learns that the job is dressing up in a hotdog costume and handing out samples. Every dark cloud has its lining, Dan discovers, when he, or rather Frank Lee Better, his mascot persona, gains the attention of a pretty girl named Brooke. The attention is great until Dan finds himself under attack from Cupcake Katie and a mysterious guy with a strange interest in Brooke. It's not until he's huddling in a bathroom in his tight white underwear that Dan begins to suspect Brooke's attention might be too good to be true.