Polly's visit to her grandparents in Connecticut becomes an extraordinary experience as she encounters old friends and mysterious strangers and finds herself traveling back in time to play a crucial role in a prehistoric confrontation.

Sixteen-year-old Gwyneth discovers that she, rather than her well-prepared cousin, carries a time-travel gene, and soon she is journeying with Gideon, who shares the gift, through historical London trying to discover whom they can trust.

Sixteen-year-old Gwen, the newest and final member of the secret time-traveling Circle of Twelve, searches through history for the other time-travelers, aided by friend Lesley, James the ghost, Xemerius the gargoyle demon, and Gideon, the Diamond, whose fate seems bound with hers.

Risika, a teenage vampire, wanders back in time to the year 1684 when, as a human, she died and was transformed against her will.

"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"-- Rigg possesses a secret talent that allows him to see the paths of people's pasts. He joined forces with another teen with special talents on a quest to find Rigg's sister and discover the true depth and significance...

"From the moment the Hourglass group violated the rules of the space time continuum to rescue a murdered loved one, time has been in flux. People from other centuries slide into our time, intruding into our space, threatening our world. Frantically seeking a way to turn back this tide, the Hourglass begins a search for the legendary Infinityglass, tracking it to the city of New Orleans, a place where the past rests easily with the present. Quiet,...

While Loki prepares his ship, Naglfar, to begin the final battle of Ragnarok, Magnus and his friends set sail to reach the vessel before it's ready, but angry sea gods and a fire-breathing dragon may prevent them from arriving in time.

Witnessing a bank robbery gone awry, misfit 15-year-old Zoe, a girl with supernatural ability to jump back in time and repeat events with up to 10 tries, attempts to stop the crime but only makes things worse with each successive effort.

Former high school enemies Solara Brooks and Doran Spaulding must team up when they find themselves aboard a renegade spaceship.The outer realm may be lawless, but it's not like the law has ever been on Solara Brooks's side. Since off-world travel doesn't come cheap, Solara indentures herself in exchange for passage to the outer realm. She just wishes it could have been to anyone besides Doran Spaulding, the rich pretty-boy who made her life miserable...

Sixteen-year-old expert archer Merry Owen is desperate to save her family's farm in Wales, in the shadow of the Black Castle, and when she finds a buried chest containing an ancient and hopefully valuable Welsh text, she hopes it will be the key to a fortune--and so it is, but not in the way she expected, for it sends her and her friend James de Courcy into past.