Twelve-year-old Theodore “Teddy” Roosevelt Fitzroy believes that Henry, the hippopotamus at the brand-new FunJungle, has been murdered. The zoo’s top brass claim the hippo went belly up the natural way, but Teddy and his feisty friend Summer McCraken have other ideas. Could the culprit be FunJungle’s animal-hating head of operations? Or is it FunJungle’s owner - Summer’s dad - a man who is much more concerned about money than animal welfare? The deeper Teddy and Summer dig, the more danger they’re in - because when it comes to hippo homicide, the truth can’t be caged!

Teddy Fitzroy, his family, and some other FunJungle employees have been invited to visit a bison ranch just outside Yellowstone National Park that FunJungle’s owner, J.J. McCracken, is considering purchasing. But as usual, trouble isn’t far behind. The ranch’s endangered bison have been mysteriously disappearing. Then a massive local grizzly bear named Sasquatch breaks into the house, causing chaos. In the aftermath, Kandace McCracken discovers that her exceptionally expensive sapphire necklace has vanished.

After an escaped kangaroo starts a fire that burns down his house, Teddy Fitzroy accepts an invitation to go to Malibu with his girlfriend, Summer, and her mother, Kandace. He’s hoping to spend some time relaxing on the beach, but wherever Teddy goes, trouble isn’t far behind. First, a massive dead whale has washed up on the beach—and before anyone can determine what killed it, it explodes. Doc, the head vet from FunJungle, suspects something fishy is going on and ropes Teddy and Summer into helping him investigate.

Ben Ripley may only be in middle school, but he's already pegged his dream job: CIA or bust. Unfortunately for him, his personality doesn't exactly scream "secret agent". In fact Ben is so awkward, he can barely get to school and back without a mishap. Because of his innate nerdiness, Ben is not surprised when he is recruited for a magnet school with a focus on science - but he's entirely shocked to discover that the school is actually a front for a junior CIA academy.

Like his fellow lunarnauts - otherwise known as Moonies - living on Moon Base Alpha, twelve-year-old Dashiell Gibson is famous the world over for being one of the first humans to live on the moon. And he's bored out of his mind. Kids aren't allowed on the lunar surface, meaning they're trapped inside the tiny moon base with next to nothing to occupy their time - and the only other kid Dash's age spends all his time hooked into virtual reality games.