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What do you do when your knight in shining armor lives, literally, in a different world? Most American teenagers want a vacation in Italy, but the Betarrini sisters have spent every summer of their lives among the romantic hills with their archaeologist parents. Stuck among the rubble of medieval castles in rural Tuscany on yet another hot, dusty archaeological site, Gabi and Lia are bored out of their minds … until Gabi places her hand atop a handprint in an ancient tomb and finds herself in 14th-century Italy.

When fragile 16-year-old Hope Walton loses her mom to an earthquake overseas, her secluded world crumbles. Agreeing to spend the summer in Scotland, Hope discovers that her mother was more than a brilliant academic but also a member of a secret society of time travelers. And she's alive, though currently trapped in the 12th century, during the age of Eleanor of Aquitaine. Hope has 77 hours to rescue her mother and get back to their own time.

It's 1986 and 16-year-old Zoe Brenner's world revolves around Depeche Mode, Judd Nelson, exercise-obsessed parents, and her best friend Jonah. Then one day, in a freak Fun-Dip choking accident, Zoe falls unconscious, and awakes in the year 2016. So much has changed, and Zoe needs Jonah to help her make sense of it all. But in this life, Zoe is the most popular girl in school, and she soon realizes this Zoe doesn't associate with nerds like Jonah.

It's the year 2069 and even though 18-year-old Bianca Butterman is heir to the family biz, she may never see the day her time-craft license becomes official. When a government agent starts nosing around the operation, Butterman Travel, Inc. gets stuck with a full audit-part of a government take-over scheme to shut down all private time travel agencies.

A boy from the past. A girl from the future. Their love could be forever, but their time is running out.... Madeline falls in love with Samuel when she accidentally time travels hundreds of years into the past to a war between the colonists and Native Americans. Their relationship is forbidden. But Madeline's travels to the past not only to fall in love, but also to claim her birth right as a Messenger, a soul who can slip through time's fabric, delivering messages that change one life, or save many.

Quinn Robbins has just returned from spending ten days in Eirentheos, a world she had never known existed. Trying to settle back into her familiar life and establish a relationship with her new boyfriend, Zander, is more of a challenge than she ever dreamed it would be. Things are just beginning to feel normal again when Thomas shows up in her world, and invites her back to Eirentheos for a royal wedding. She's excited at the chance to reconnect with the people and places she had begun to fall in love with.

Casey Donovan has issues: hair, height, and uncontrollable trips to the 19th century! And now this - she's accidentally taken Nate Mackenzie, the cutest boy in the school, back in time. Awkward.

For the first time in her life, Hope Walton has friends...and a (maybe) boyfriend. She's a Viator, a member of a long line of time-traveling ancestors. When the Viators learn of a plan to steal a dangerous device from the inventor Nikola Tesla, only a race into the past can save the natural timeline from utter destruction. Navigating the glitterati of the Gilded Age in 1895 New York City, Hope and her crew will discover that high society can be as deadly as it is beautiful.

Endlich am Ziel! Nach einer strapaziösen Flucht durch Sümpfe und Wüsten erwacht Jem in der Oase der Zeitspringer. Doch wie ist er hierher gekommen und wo sind seine Freunde? Katta ist verschwunden, Lucie und der kleine Squid liegen im Koma. Als Anführerin GAIA sich seiner annimmt, keimt in Jem Hoffnung: auf Rückkehr, auf ein neues Leben. Aber dann erwacht Lucie und den Freunden wird klar, in welch perfides Spiel sie geraten sind. Ein Spiel, das die Zukunft der Erde bedroht.

Chevie Savano ist ins 21. Jahrhundert zurückgekehrt. Aber durch ihre Reise in die Vergangenheit hat sich der Zeitenlauf verändert. Die halbe Welt befindet sich nun im Krieg und Chevie soll als Kadettin ausgebildet werden. Doch glücklicherweise gibt es auch in dieser Gegenwart eine WARP-Kapsel...

Reclusive college student Jonathan Tibbs wakes in a pool of blood, not a scratch on him. His life is about to undergo a massive shift. A violent and merciless otherworldly enemy unleashes slaughter in the streets, calling out in a language only he understands. And it is seeking its challenger. In order to defeat the threat, Jonathan must become a temporal weapon...while remaining completely anonymous. Unfortunately, harnessing off-world powers has its own special challenges...

Their love was so strong it reached across the ages. Now it just might kill them. Lucy Channing is back in her time of 1815, where she's engaged to her childhood friend, the handsome Dashel Rothchild, 7th Earl of Westington. He's incredibly sweet, a complete gentleman, and not the man Lucy loves. But that's the least of her problems. The Egyptian God of Chaos and the irritating Moon Goddess have taken a special interest in Lucy and Will, the man she's actually in love with (and incidentally is from the 21st century).

When Rigg and his friends crossed the Wall between the only world they knew and a world they could not imagine, he hoped he was leading them to safety. But the dangers in this new wallfold are more difficult to see. Rigg, Umbo, and Param know that they cannot trust the expendable, Vadesh - a machine shaped like a human, created to deceive - but they are no longer certain that they can even trust one another. But they will have little choice.

Rigg’s journey comes to an epic and explosive conclusion as everything that has been building up finally comes to pass, and Rigg is forced to put his powers to the test in order to save his world and end the war once and for all.

Gwen's life has been a rollercoaster since she discovered she was the Ruby, the final member of the secret time-traveling Circle of Twelve. In between searching through history for the other time-travelers and asking for a bit of their blood (gross!), she's been trying to figure out what all the...

In Kerstin Gier's Emerald Green, Gwen has a destiny to fulfill, but no one will tell her what it is. She's only recently learned that she is the Ruby, the final member of the time-traveling Circle of Twelve, and since then nothing has been going right. She suspects the founder of the Circle...

Gwyneth Shepherd's sophisticated, beautiful cousin Charlotte has been prepared her entire life for traveling through time. But unexpectedly, it is Gwyneth who in the middle of class takes a sudden spin to a different era! Gwyneth must now unearth the mystery of why her mother would lie about her...

In this stunning sequel to A Thousand Pieces of You by New York Times bestselling author Claudia Gray, Marguerite must race through various dimensions in a desperate attempt to save the boy she loves. Ever since she used the Firebird, her parents' invention, to cross through to alternate...

Can she write a world gone wrong? A certain pen, a certain book, and a certain person can craft entirely new worlds through a branch of science called scriptology. Elsa comes from one such world that was written into creation, where her mother—a noted scriptologist—constantly alters and...

Thirteen-year-old Mark Harrison has a week to hike across the desert. He will meet his parents on the other side. By his fourth day, he’s made good time. As he settles in for the night, he gazes up at the stars, feeling completely content. Suddenly, a blue light streams from the sky, jolting Mark into another dimension. Now, in a land filled with strange jungle animals and primitive tribes, Mark desperately battles hunger, armed enemies, and superhuman powers.