Incarceron, Catherine Fisher 
Imagine a prison so vast that it contains cells and corridors, forests, cities and seas. Imagine a prisioner with no memory, sure he came from Outside - though the prision has been sealed for centuries and only one man has ever escaped.
Imagine a girl in a manor house, in a society where time is forbidden, held in a 17th-century world run by computers, doomed to an arranged marriage, tangled in an assassination plot she dreads and desires.
One inside, one outside.
The Selection, Kiera Cass 
In a world of glitering gowns and priceless jewels THE SELECTION is the chance of a lifetime: to compete for gorgeous Prince Maxon's heart. But for America Singer it means tuning her back on her secret love, nad leaving home for a prize she doesn't want.
Then America meets Maxon and all her plans start to crumble. Can the life she's always dreamed of compare to a future she never imagined?
Ruby Red, Kerstin Gier 
Although I had never seen him before, I recognized him immediately. I'd have known his voice anywhere. This was the guy I'd seen on my last journey back in time.
Or more precisely, the onde who'd kessed my doppelganger while I was hiding behind the curtain in disbelief.
Sisteen-year-old Gwen lives with her extended - and rather eccentric - family in an exclusive London neighborhood. In spite of her ancestors' peculiar history, she's had a relatively normal life so far. The time-traveling gene that runs like a secret thread through the female half of the family is supposed to have skipped over Gwen, so she hasn't been introduced to "the mysteries", and can spend her time hanging out with her best friend, Lesley. It comes as an unwelcome surprise when she starts takin sudden, uncontrolled leaps into the past.
She's totally unprepared for time travel, not to mention all comes with it: fancy clothes, archaic manners, a mysterious secret society, and Gideon, her time-traveling counterpart. He's obnoxious, a know-it-all, and possibly the best-looking guy she's seen in any century...