Believing his only chance of popularity--and perhaps even survival--while riding the infamous 121 Express bus to school is to join in the mayhem, Lucas has second thoughts after his behavior has serious consequences for the driver and an elderly passenger.

Leni has lived in so many different places in the last few years that she's not surprised when her mom wakes her in the middle of the night and tells her to pack up her things. The reason for this move? Her mom tells her they have won the lottery, and they have to go underground. Leni is still not surprised when they end up in a filthy motel. But when Leni makes a new friend and tries to explain their lifestyle, she begins to understand just how messed-up her life has become.

Following the demise of his first band, Ace has started a duo called Two with Lisa, a girl he has a huge crush on. As Ace and Lisa get serious about their music, Denny, Ace's hapless friend, tries to help out by filming their every move so that he can create the ultimate music video. As a joke, Denny puts together a Two video capturing all of the embarrassing moments-moments that Lisa in particular doesn't want shared. Somehow, the video gets posted on YouTube. Lisa and Ace find themselves starring in the latest comedic viral video. Lisa is humiliated and refuses to talk to Ace-until their fame turns out to have positive results.

When a stink bomb at the school provides a chance for Angus to talk to Ella, he claims to share her interest in reading facial expressions and declares his ambition to become a crime-solving mentalist.

Fifteen-year-old Christine is visiting her eccentric great-aunt in historic Witcombe, where a pickpocket has been victimizing tourists. Aunt Maude owns an antique store and also runs the town's ghost walk, which gives Christine the opportunity to meet local characters and visitors, including a mysterious young man who seems to know far too much about the crimes. When the pickpocket targets Aunt Maude's store, Christine is determined to find out who is behind the thefts. Her search takes her through the nooks and crannies of the quaint town full of stories, and she unearths more than one surprise.

Lindy has been working hard cleaning and doing odd jobs around the neighborhood to earn money for a trip to the Arctic. When Mrs. Naulty, an elderly client, mistakenly pays her a huge amount of money, Lindy keeps it to pay the early-bird rate for her trip. It's only when a schoolmate learns what she did and starts blackmailing her that Lindy starts to suffer for her actions.

While volunteering at the local zoo, Robyn, Nick and Trevor learn that grizzly bears are being poached and their gall bladders removed for use in alternative medicine. Always ready to solve a mystery, the kids set out to find the poachers. Bear is not only big game, they learn, but big money to poachers. The stakes are high and the suspects many, as the kids head into their most dangerous adventure yet.

When Cody and his friends accept a challenge from a local gang to steal a park bench, their main concern is keeping themselves on the gang's good side. Cody learns that the stolen bench had been dedicated to the father of the English teacher who sponsors the school newspaper—the paper that Cody has just started writing for—and he's worried about the consequences. As the gang applies pressure for more from Cody and his friends, he realizes they've crossed a line, and now he has to figure out how to make it right.

As much as life has irrevocably changed since the death of his father, much has stayed the same for Cam. He's always had a great deal of responsibility around the house, but the burden is heavier now in combination with the load of grief he's been carrying. After the man who was driving the truck that killed his father turns up at the end of the driveway, Cam feels pressure to keep his family safe as well. He starts to see the man everywhere: at his work, in stores, at his sister's school. Cam needs to know what the man wants from his family, and he starts following his father's killer in search of answers.

After a lifetime of New Age "adventures" with her weirdo hippie mom, fifteen-year-old Maddie is realizing a lifelong dream and visiting New York City. Armed with her 130-item to-do list, Maddie hits the streets of New York with her friend Anna and Anna's brother, Thomas. Maddie drags her friends around on an epic quest for the ultimate art-show outfit, oblivious to the fact that they don't share her passion for vintage clothing. Three days into the trip, a most unwelcome surprise--the arrival of Maddie's mother--threatens to derail the entire adventure. As her mother's obsession with dietary trends and fortune-tellers takes center stage, and everyone's tempers get thin, Maddie has to face some ugly facts about how she's been treating her friends.

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.

Trevor, Robyn and Nick decide they have a mystery to solve when Trevor discovers a suspicious looking young man snooping around. They learn about missing research involving the use of carob beans to aid in cancer treatment-potentially valuable information. With a shady looking grad student, a bitter activist and an employee of a medical research firm to deal with, our amateur sleuths are faced with their greatest challenge yet.