The time machine tempts seventeen-year-old Memphis Quil into adventure, but she gets more than she expected.

Broken and malfunctioning, the contraption hurls Memphis through the Thirteenth Hour, a wormhole connecting Memphis's reality to the Collateral Universe.

Trapped in a world she doesn't understand, Memphis discovers the people of the Collateral Universe are at war. The Sovereign Federation stands against the lethal New Federation. One side is willing to help her return home-the other would seize control of the Thirteenth Hour at a dreadful cost.

With the wormhole pulling the...