At the flea market nine-and-a-half-year-old Chase and his younger sister Ava acquire an old suitcase filled with rows of carefully packed strange objects, and when they handle one of the objects (a dragon-headed doorknob) they find themselves in King Arthur's castle, on a mission to save the King--and pursued by a strange man whom they first saw at the flea market, who is after their suitcase.

"When a mysterious note invites them to Camelot, Jack and Annie travel in the magic tree house to the magical kingdom where they must find a lost dragon"--

"In this illustrated novel for middle-grade readers, Billy Stuart and his loyal Scout group get lost on a hike and inadvertently travel through time"--

Charlie, a math genius with otherworldly skills, is plucked out of his own time by Geneva, a bionic girl from the future, and recruited to help defeat Gramercy Foxx, a tycoon who plans to unleash a deadly biological computer virus that will enslave the world--and the two children have only twenty days to accomplish their task.

This time the mysterious box transports the golden retriever Ranger back to the shipyards of Belfast in 1912, where a ship is being prepared for her maiden voyage, and when he saves young Patrick Murphy from being crushed by falling boards, Ranger expects to be transported home; when he is not, he knows that somehow his job is not finished--but then, Ranger has never heard of the Titanic, and knows nothing of the fate that awaits Patrick, and all...

Jonah was able to save all of time from collapsing but in doing so gained a twin brother, Jordan, who must learn what has happened and do his own part to save time--and his parents.

Blendin Blandin is searching for the legendary Time Pirates' Treasure, and he needs Dipper and Mabel's help... and yours, too! Journey through time and explore the dragon-infested medieval era, the Weird-and-Wild West, and the laser-and-giant-baby-filled future. YOU choose from multiple paths that lead to different wacky adventures! You might end up finding the greatest treasure ever known, or you could send the twins and Blendin into an abyss from...

"Now that her sisters Natasha and Darya have had their turn, Ava Blok finally gets her Wishing Day. But after seeing the unintended consequences of the wishes her sisters made, she's not sure what to wish for. The only thing she's certain of is that it's her job to set things right. Hopeful that she can put her broken family back together, and eager to prove her pessimistic older sisters wrong, Ava realizes that fixing the future means changing...

"In this illustrated novel for middle-grade readers, Billy Stuart and his loyal Scout group have inadvertently traveled through time and are trapped in a labyrinth with King Minos's Minotaur."--

When thirteen-year-old Arthur of Gal, the future King Arthur, accidentally time-travels to the twenty-first century, Sophie Sawyer, twelve, must convince him to return and correct the time line.