Memory's gate
Paul McCusker
Fifteen-year-old Elizabeth volunteers in a retirement home where a con man promises the elderly that they can slip through a time fault line and return to their past.

by Lynne Ewing (2004)
Vanessa, Catty, Serena, and Jimena, four girls with supernatural gifts living in Los Angeles, battle the forces of the evil Atrox as it attacks in a variety of ways.
Paul McCusker
Fifteen-year-old Elizabeth volunteers in a retirement home where a con man promises the elderly that they can slip through a time fault line and return to their past.
Scarlett Ryan Foster
Two young brothers discover a buried Viking dagger near their Michigan home and find themselves transported to tenth-century Norway, where they are forced to accompany Viking warriors as they search for their kidnapped children across Europe and into Africa.
John Bellairs
Johnny Dixon and Professor Childermass discover a trolley which transports them back to Constantinople in 1453 as the Turks are invading the Byzantine Empire.
Eric Flint and Charles E. Gannon
"Most of the Church's senior leaders have converged upon the city of Besancon in Burgundy, where Pope Urban's renegade papacy, now on the run from the Vatican's would-be usurper Borja, plans to offer an ecumenical olive branch to the other Christian denominations with which Rome has been at war. Fortunately, Urban has up-time help relying on Cardinal Protector Larry Mazzare's theological savvy, Sharon Nichol's medical skills, and a small contingent of the Hibernian Battalion on loan by Mike Stearns. Which is prudent as Borja's assassins and other killers are determined to stop him"--