The Doomsday Device — Jason Krumbine

It's the final chapter in the Castle Sister's battle against the villainous Agent Dark and the Tancredi Group.

Truths will be uncovered.

Lies will be revealed.

The End has arrived.

New York City is under siege and Agent Dark stands at the precipice of achieving everything he's worked for. The world is within his grasp and the only people that stand in his way are Faith and Summer Castle.