The Awakening By Kelley Armstrong

In the sequel to The Summoning, Chloe Saunders finds herself betrayed, and back in the hands of the Edison Group. There she discovers the truth: she's part of an experiment, her genes modified in an attempt to suppress her supernatural powers. But when she manages to get away--with the help of an unlikely ally--and join Simon and Derek again, she finds that the Edison Group is relentless and ruthless, and keeping away from them will be harder than they originally thought. In the meantime, Chloe learns that controlling her powers is a lot harder than she imagined, and there's too much she doesn't know...
The Awakening is even more riveting and full of nonstop action than its prequel. Armstrong offers an unflinching and oftentimes grim look at what life on the streets is like for teens, with the added appeal of a perfectly sinister and powerful enemy and the suspense of unknown supernatural powers. Armstrong's teen characters are smart and resourceful, and each obstacle thrown their way requires them to use every bit of caution, wits, and intelligence they possess. Armstrong focuses a little more on the technical aspects of the teens' powers and abilities as Derek and Chloe especially explore their capabilities and restraints. Their difficulties and the tension that they face help them grow as characters and make them more appealing characters to the reader. This dark, gripping, and highly suspenseful read will have readers chomping at the bit for a sequel.