This was an interesting take on an old theme. Time travel and romance. Jackson has a secret but it seems that more people know about it than he realized. His jumps to the past are harmless fun and a great source of data for his geek friend Adam who is helping him develop his new talent. But he becomes the hunted and his girlfriend is shot when the Enemies of Time try to recruit him. There is nonstop action and plenty of danger as Jackson desperately tries to change Holly's fate and possibly his own.I enjoyed the book and the suspense kept me turning the pages. As secrets of the past are revealed more complexities are slowly unveiled. I enjoyed the storyline and this take on time travel. I liked most of the characters, especially the quirky ones. The teenagers were usually believable as teens and age appropriate. They were quite self absorbed in the beginning but the more obstacles they faced the more they changed and matured.It may be because I'm older and not a teen but there were details that bothered me. I don't want to give anything away so I won't list many specifics. I found some of the actions to be odd and not so believable. These kids have had their lives threatened but security often leaves them alone. Do they really need to go for a walk when their enemy can literally pop up at any time? And later in the story the time travel became confusing because it branched out in so many directions. The loose threads do set up the storyline for the rest of the trilogy though. I am curious to see how they untangle and I look forward to the next book coming in 2013. Overall I found it to be a good start to the series and an easy read by the fireplace.Thank you to LibraryThing Early Reviewers for an ARC to review.