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 two universes together, Memphis must join the Set of Three-gifted elites capable of finding and destroying the wormhole. She needs to find Pan Rexford, the ingressor who can destroy the Thirteenth Hour, and Mordred Astaire, an anger-filled hunter who can sense where the wormhole will appear next.
Politics, secrets, and betrayal dog the Set of Three, consequences of a history Memphis knows nothing about. Unless she can uncover the strange world's secrets, she may have to watch as two universes collide.