Mara Voss stood beside me at the waterfront launch and announced that her company had built the one battery mine couldn't afford to ignore. The prototype onstage was mine. Twelve years earlier, I had watched her take the credit, then spent the rest of my life trying to ruin her. This time, I knew what the theft would cost both of us. Mara met my eyes across the crowd, and I saw the same impossible recognition I felt in my own bones. We had both been given another chance. Now the question was whether two women who had once destroyed each other could build something powerful enough to survive the people waiting to take it from us.