Watcher by Nola Nash

Destiny doesn't care if you want it or not.

Having made the time jump to her destiny, Shelby Starling finds herself, along with Benny, in the midst of the battle for Athens in 404 BC. While Apollo might have provided clothing for the time period and the ability to understand languages, he also tossed in some riddles for good measure in the form of a cloth with a single word on it and the Victorian Traveler Elijah Faircloth's journal that seems oddly useless in ancient Greece.

It soon becomes clear that winning the war against Sparta wasn't their destiny as the god had led them to believe. Instead, they've been sent on a hunt for a traitorous and womanizing Greek general, Alcibiades, whom Apollo wants to punish for lifetimes of atrocities against humanity.

With little choice, since destiny will not relent until it's fulfilled, Shelby and Benny are made Watchers with the ability to make the time jump on their own in search of the slippery Traveler Alcibiades. Following their target through history and all over the world to some strangely familiar times and places, the reason for Eli's journal becomes more obvious as the true identity of its author becomes clear.

Will Shelby, with Benny's steadfast help, be able to bring her Traveler back to Apollo or will he continue to slip through her fingers? Will her connection to the magnetic general bring them too close for her to turn him over to the gods to pay for his crimes?