The Edge of Forever by Melissa E. Hurst

In 2146, time travel is possible. But only for those with a specific gene. Bridger has the gene and is on training trip to the year 2076 to witness the assassination of the president. Bridger and his fellow cadets wear cloaking devices so as to not be seen while they record specific aspects of the event. It is most important to not disrupt the timeline.

In the chaos of the assassination, Bridger separates from his mission partner (and girlfriend) Vika. He sees his dad, a fellow time traveler who died months ago. His father's only words, "Save Alora, son." Bridger knows his father was never assigned to this time period. He also has no idea who Alora is and why she needs to be saved. If it involves time travel, Bridger's father is asking him to break the law.

Alora lives in 2013 with her aunt in a small Georgia town. At the age of six, her father left her there and has not been seen since. Alora's aunt refuses to tell her anything about her parents, so Alora must find any information she can even if it means breaking her aunt's rules. She is just starting to uncover things (in her aunt's room and the attic) when a guy named Bridger appears.

Bridger was never supposed to interact with Alora, but an injury upon his arrival makes that impossible. Why is Alora so important and can he save her without messing up the timeline? These are only two of the many questions that make the story so intriguing.

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