Bradley, Brian, Nate, and Lucy follow clues to find whoever left a rabbit in their first-grade classroom on Valentine's Day, because they are worried the rabbit will get sick and die of loneliness.

Someone has been stealing and leaving behind little green sneakers, so Bradley, Brian, Nate, and Lucy trail their new teacher, who wears the same shoes in normal size.

Ella and her twin brother Owen head out on a new adventure in search of special ingredients to make their mom a cake, but end up being turned into newts, and running into a Stinky Fish Monster that wants to eat them.

Olive Torres is used to being the unlucky twin: from inexplicable mishaps to a recent layoff, her life seems to be almost comically jinxed. By contrast, her sister Ami is an eternal champion ... she even managed to finance her entire wedding by winning a slew of contests. Unfortunately for Olive, the only thing worse than constant bad luck is having to spend the wedding day with the best man (and her nemesis), Ethan Thomas. Olive braces herself for...

Ten years after Alex and Aaron Stowe brought peace to Quill and Artimé, Alex and his Unwanteds set out to rescue his sister, Thisbe, from dragon land leaving her twin, Fifer, behind.

Anxious eighteen-year-old Tally and her twin Max set off on a whirlwind high school exchange trip to Israel where she grapples with her Jewish identity, mental health, and sexuality.

"At fifty-one years old, twins Jeanie and Julius still live with their mother, Dot, in rural isolation in the English countryside. The cottage they have shared their entire lives is their only protection against the modernizing world around them. Inside its walls, they make music, and in its garden, they grow everything they need to survive. To an outsider, it looks like poverty; to them, it is home. But when Dot dies unexpectedly, the world they've...

Cash, Fitch, and Bird Thomas are three siblings in seventh grade together in Park, Delaware. In 1986, as the country waits expectantly for the launch of the Space Shuttle Challenger, they each struggle with their own personal anxieties.

Can a mysterious sea creature save eleven-year-old Jamie's very sick twin brother?

As the Wanteds, Unwanteds, and Necessaries struggle to adjust to changes in their society, Mr. Today begins training fourteen-year-old Alex to replace him as Artime's leader one day while Alex's disgraced twin, Aaron, connives to take over Quill.