The Kronos Key (Book 1 of the Titan Key Chronicles)

Adam never wanted to go to ancient Greece. Okay, that's a lie. Of course he did. But not like this.

It's the first day of summer, and Adam finds himself exploring an abandoned tornado shelter. It was his best friend Sofia's idea (after all, it always is). Inside the shelter, the two stumble upon an old key. It's the Kronos key—an ancient artifact with a secret, dangerous, terrifying power. It can turn any door into a portal to another time.

But no one told them that. So, when they use it to open one of the shelter's closet doors, they suddenly find themselves catapulted to the last place they expect: ancient Greece.

And ancient Greece isn't happy to see them. They've stumbled into a village enslaved by an army of ruthless Spartans led by the sinister General Iakovos, who will stop at nothing to capture Adam and Sofia and use the Kronos key's powers to invade all of Greece. 

But, to make matters worse, the Kronos key is a one way ticket. To escape the Spartans and get back to their time (alive), Adam and Sofia must win the help of the timekeeper, the only man alive who knows how to use the key.

But the timekeeper guards his power carefully. Will Adam and Sofia gain his trust? Will they pass his trials and be deemed worthy to bear the secret of the Kronos key? 

The Golden Spike (Book 2 of the Titan Key Chronicles)

Getting kidnapped by an infamous outlaw gang wasn't on Sofia's list of things to do this summer. But hey, neither was running from Spartans bent on her destruction, and that worked out okay. (Kinda?)

Against all odds, Sofia, Adam, and Hector have stolen the Kronos key from the clutches of their Spartan captors and the burning Kronos temple.

But now the mythical Kronos key, which turns any door into a portal to another time, has taken the trio sometime new: 1869, on the eve of the joining of the transcontinental railroad.

But there's a problem (and that's pretty common for Sofia). The train they're on, the Jupiter, is carrying precious cargo—a golden spike. It was supposed to be used to nail the last railroad tie of the transcontinental railroad in place, but the infamous Barr gang and their crazed leader have different ideas. And, when they rob the train to steal the spike, they decide to take Sofia with them.

Desperate to find her, Adam and Hector join up with Freeman, a former slave turned cowboy and law man who will stop at nothing to save Sofia and put the Barr gang's reign of terror to an end.

Will Sofia escape? Will Freeman, Hector, and Adam find her and the golden spike before the kidnappers disappear forever?