Casey will have to do a lot of pet-sitting to earn the money she needs to buy Lightning, a beloved horse. Her hopes of buying Lightning are dashed when she learns that his owner has found a buyer and must sell the horse immediately. Across the street from Casey's house a mystery unfolds as a seldom-seen woman who seems to be able to read minds prepares to host a carnival and a yo-yo contest that boasts a $1500 prize. Casey's yo-yo is buried in her closet. She has a great talent and a greater case of stage fright.
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.
Jake and his younger brother Tommy are visiting family at a beach house on the coast. Having already lost a race to his cousin Lexie, Jake can't resist a second chance at victory when she challenges him again. Only this time it's a boat race-to the legendary Smuggler's Cave and back. The ocean is deep and choppy, and the boat is harder to control than Jake thought it would be. When he and Tommy reach Smuggler's Cave, the unthinkable happens. The boat capsizes, and they are swept into the cave. Lexie comes to their rescue, but the rising tide prevents them from escaping, and the three of them soon realize they are trapped.
Clay would much rather work as a lifeguard at the beach than at Safari Splash, the new water park in town. He's certain the summer will drag along, despite his position at the Boa, the park's fastest slide. The summer job starts to get interesting when he learns that someone has been wandering the park in a lynx costume, scaring the staff. When forty thousand dollars is stolen from the till, and his friends are under suspicion for the theft, boring is starting to look good. But Clay is certain that the mask and the thefts are connected, and he's determined to solve the crime.
Dylan and his friends snowball cars for entertainment on the weekend. When they don't get enough reaction from passing cars, they put rocks in the middle of their snowballs. Their first attack with the loaded snowballs causes a car crash. His friends flee, but Dylan goes to the scene of the accident to make sure the driver is okay. He runs off when he knows help is on the way. Dylan is sighted, and rather than being punished, he is lauded as a hero. As his lies pile up, so does the hype about his heroics, and along with it, Dylan's guilt.
