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Marguerite Caine has done the impossible, traveling to alternate dimensions with the Firebird - the brilliant invention of her parents; her boyfriend, Paul; and their friend, Theo. But she has also caught the attention of enemies willing to kidnap, blackmail, and even kill to use the Firebird for themselves. When Paul's soul is splintered into four pieces - pieces that are trapped within Pauls in other dimensions - Marguerite will do anything and travel anywhere to save him.

Would you sacrifice your future... for an uncertain past? Gabriella and Evangelia Betarrini are just two normal American teenagers. Normal - except for the fact that they time travel to fourteenth-century Italy, where they’ve lived in castles, become swept up in historic battles, and fallen in love with handsome knights willing to do anything to keep them alive.

Cade has managed to survive the duel with the Hydra Alpha - barely. But the Games are far from over. By order of their cruel and mysterious overlord, Abaddon, Cade and his friends are sent off to war against the Greys, a humanoid race who have far surpassed humans in technology on their home planet. This attempt to move up the leaderboard, however, leads Cade to a game-changing revelation: The Pantheon - the millennia-old alien masterminds behind the Games - have a weakness.

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 mysteries and prophecies surrounding the Circle really mean. At least Gwen has plenty of help. Her best friend Lesley follows every lead diligently on the Internet. James the ghost teaches Gwen how to fit in at an eighteenth century party.

When Jack and Kate meet at a party, bonding until sunrise over their mutual love of Froot Loops and their favorite flicks, Jack knows he’s falling - hard. Soon she’s meeting his best friends, Jillian and Franny, and Kate wins them over as easily as she did Jack. But then Kate dies. And their story should end there. Yet Kate’s death sends Jack back to the beginning, the moment they first meet, and Kate’s there again. Healthy, happy, and charming as ever. Jack isn’t sure if he’s losing his mind.

When Kate Pierce-Keller’s grandmother gives her a strange blue medallion and speaks of time travel, sixteen-year-old Kate assumes the old woman is delusional. But it all becomes horrifyingly real when a murder in the past destroys the foundation of Kate’s present-day life. Suddenly, that medallion is the only thing protecting Kate from blinking out of existence. Kate learns that the 1893 killing is part of something much more sinister, and her genetic ability to time travel makes Kate the only one who can fix the future.

The final stretch of Arlan’s journey is here, but with it, the Demons’ final stand. Arlan has one last obstacle in his way before he can escape from imminent death—a monster-infested mountain range. But just as much as the monsters pose a threat to him, they also pose an opportunity. After all, an enemy is just a Level-up waiting to be claimed. The Demons are intent on not giving Arlan the time to get strong enough to beat them, though.

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 birth date to ward off suspicion about her ability, brush up on her history, and work with Gideon, the time traveler from a similarly gifted family that passes the gene through its male line, and whose presence becomes, in time, less insufferable and more essential.

One day, monsters spawned across the world, gateways to dungeons appeared everywhere, and the blue screens heralded the end of days. The apocalypse. The ruin of the world. Amongst the ruins of the world, they survive: the players, those granted power by the system and led by the 2nd regressor, the King of the Crows. He who mastered the system, learned the truth of the apocalypse, and seized the keys of absolute authority. But even a King cannot stop the fall of mankind.

Esta isn’t a stranger to high-stakes heists. She’s a seasoned thief who has no reservations about using her affinity for time to give her an edge, and she’s trained her whole life for one mission: travel back to 1902 New York, steal the ancient Book of Mysteries, and use its power to destroy the Brink and free the Mageus from the Order’s control. But the book held a danger that no one anticipated - Seshat, an angry goddess, was trapped within its pages.

Welcome to season three! Return to the Demigods Academy in this new, exciting installment full of your favorite Gods and Demigods. After waking up on the floor of an abandoned warehouse, with no memory of her life, where she came from, or even an ID, Nicole had to resort to the oldest profession in the world—relax, she’s just stealing for a living. Unlike her best friend, Pinky, she has never believed in the Gods or their legendary academy, where special recruits train to become Demigods and protect the world.

Etta Spencer didn't know she was a traveler until the day she emerged both miles and years from her home. Now, robbed of the powerful object that was her only hope of saving her mother, Etta finds herself stranded once more, cut off from Nicholas - the eighteenth century privateer she loves - and her natural time.

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.

Seventeen-year-old tagger Saira Elian can handle anything.… A mother who mysteriously disappears, a stranger who stalks her around London, and even the noble English grandmother who kicked Saira and her mother out of the family. But when an old graffiti tag in a Tube station transports Saira to the 19th century and she comes face-to-face with Jack the Ripper, she realizes she needs help after all.

The Kings have been in the creepy old place - their new home - for only a few days, but they’ve experienced enough terror to last a lifetime. And the mystery is growing even more baffling. Shadowy and shifting, the big house conceals doors into other worlds that blur the line between memories and dreams - and the slightest misstep can change history forever.

Margo is a troubled schoolgirl. After the death of her father, she’s on her way to a new boarding school in a new city. Moon is a salesman. He makes his living traveling through a series of interconnected worlds on a network of barely used train lines. They never should have met. But when Margo suddenly appears one day on Moon’s train, their fates become inextricably linked. If Margo wants to survive, she has to pass as a traveling salesman, too—except it’s not that easy.

Cade Carter and his friends have survived the qualifying round of the mysterious overlords' twisted games, decimated by the loss of so many of their comrades during the fight. But they have no time to mourn, for the next round of trials is about to begin. When the group discovers that their next foe will be even more ferocious than the last, Cade leads them on a quest out into their strange new world to find anything that might give them an edge. But what they find in the wilds could prove to be even more dangerous than the impending battle....

David, Xander, and Toria King never know what new adventures - and dangers - await them beyond the mysterious portals hidden on the top floor of their new house. They have battled gladiators and the German army, dodged soldiers on both sides of the Civil War, and barely escaped a fierce attack in their own home.

Addison Coleman's life is one big "what if". As a Searcher, a special type of clairvoyant, whenever Addie is faced with a choice, she is able to look into the future and see both outcomes. So when her parents tell her they are getting a divorce and she has to pick who she wants to live with, a Search has never been more important. But when Addie finds herself drawn into a murder investigation, her fate takes a darker turn. With so much to lose in either future, Addie must decide which reality she's willing to live through...and who she's willing to live without.

Gates of Thread and Stone, is about a teenage girl who must carefully stay under the radar and keep her ability - to manipulate the threads of time - a secret, until her brother goes missing and she must risk getting caught up in a revolution in order to save him. Kai learns that nothing is as it seems - including her brother’s past, her father’s identity, and her friendship with dark, troubled Avan.