Time Stoppers by Carrie Jones

When Annie, who thought she was a nobody, and James, who thought he was a normal kid, find themselves whisked away to the magical town of Aurora, both are in for surprising news. James’s​ ​family are trolls in disguise who plan to eat him on his thirteenth birthday.​ Annie has the power to stop time, and may be the only person who can save Aurora from the evil enemy known as the Raiff. Filled with danger, adventure, and unforgettable characters of the real and fantasy kind, Time​ ​Stoppers​ is the first book in a new fantasy series bound to please readers 10+.